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Physics Grade 11 Unit 6: ELECTROSTATICS AND ELECTRIC CIRCUIT

national exam questions have come from this unit. It runs 70 pages; one careful study pass takes about 8.0 hours, and its difficulty is harder among Physics units. Each section below lists the questions set from it, with the year, and opens the page that teaches it.

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6.1 Coulomb’s Law · read p. 218
  • 2016 E.C., Q6 – Three charges $Q_1 = 5\times10^{-10}\,\text{C}$, $Q_2 = 2\times10^{-10}\,\text{C}$ and $Q_3 = 3\times10^{-10}\,\text{C}$, are placed on the x axis at points $x = 0$, $x = 2\,\text{cm}$ and $x = 4\,\text{cm}$, respectivel
  • 2015 E.C., Q34 – A positive point charge of 2 μC is placed on the x-axis at the origin and a positive charge of 6 μC and a negative point charge of -4 μC are placed, respectively at x=-3cm and x=+3cm on the x-axis. What is the net electr
  • 2010 E.C., Q27 – Suppose that three point charges are placed along a straight line and electrostatic force exerted on the middle charge is zero. What can we conclude about the charges?
6.2 Electric Fields · read p. 225
  • 2018 E.C., Q52 – Which one of the following statements is correct about electric field lines?
  • 2017 E.C., Q31 – An electric field is defined as a region where
  • 2017 E.C., Q34 – What is the magnitude of electric field strength at a distance of 2.0 m from a point charge, $Q = 4.0\mathrm{C}$?
  • 2015 E.C., Q1 – Which one of the following units is NOT a possible unit of electric field strength?
  • 2013 E.C., Q18 – According to Gauss's law the net electric flux through any hypothetical closed surface is proportional to the enclosed;
  • 2007 E.C., Q37 – A square flat loop of wire is placed in a uniform magnetic field that is in the y direction. The magnetic flux through the loop is a maximum if the plane of the loop is in the
  • 2007 E.C., Q29 – Which one of the following statement is correct?
6.3 Electric Potential · read p. 232
  • 2016 E.C., Q35 – A point charge of $Q=2\times10^{-8}\,\text{C}$ is placed in xy plane at the coordinate position of $(4, 2)\,\text{cm}$. What is the value of the electric potential produced by the charge at a point P which is located at
  • 2015 E.C., Q35 – Consider a point charge Q in an electrostatic field and a point mass m in a gravitational field. Which one of the following statements is correct about the potential energy of the objects?
  • 2014 E.C., Q12 – The electric potential at a distance of 2 cm from -1.6 change is
  • 2011 E.C., Q33 – Two equal and opposite charges are located along x-axis at −2.0 cm and +2.0 cm as shown in the figure below. How much would be the electric potential at the origin? [Figure: A horizontal line showing two charges: a charg
  • 2008 E.C., Q32 – What is the potential (V) at a distance of 10m from a charge of +5.0C? 4.45 × 109
  • 2008 E.C., Q39 – A common unit of energy in atomic physics is
  • 2007 E.C., Q30 – In a certain region of space, a uniform electric field is directed in the positive x direction. If a particle with negative charge is carried from x = 20cm to x = 60cm, what can we conclude about the electric potential a
  • 2006 E.C., Q36 – Below the axis, dashed vertical lines drop from each of the two +q charges to a dashed horizontal line, forming an open rectangle; the lower-left corner of that dashed rectangle is a solid dot labelled D and the lower-ri
6.4 Electric Current, Resistance and ohm’s law · read p. 240
  • 2018 E.C., Q55 – A junction exists on the left where the top, middle, and bottom branches meet.]
  • 2017 E.C., Q9 – We usually use plastic materials to cover metallic wires that carry electricity to protect living things from danger. Which of the following statement correctly describes the nature of the plastic to use for this purpose
  • 2016 E.C., Q41 – Suppose you are going to investigate the relation between current through and voltage across a resistor by measuring them five times. Which one of the following should be performed before taking the measurements?
  • 2016 E.C., Q33 – The current I through and voltage V across a purely capacitive AC circuit can be put as a sinusoidal function with respective peak values of I 0 and V 0 . Assuming the angular frequency of the AC source is ω, which of th
  • 2016 E.C., Q32 – A tangent galvanometer is set so that the plane of its coil is along the Earth's magnetic meridian. When current is passed through the galvanometer, its compass needle deflects by an angle θ. If B v and B h are the verti
  • 2016 E.C., Q8 – An experimenter measures a current flowing through a resistor R 1 to be 1.3 A by connecting to a voltage source of a potential difference ΔV = 6 V. Next, a second resistor of R 2 is added to the circuit with parallel con
  • 2015 E.C., Q32 – Kirchhoff's junction rule is a consequence of conservation of
  • 2015 E.C., Q36 – Four resistors are connected to a voltage source as shown in the circuit diagram shown below. What are the current through the 3 Ω resistor and the voltage drop across the 4 Ω resistor, respectively?
  • 2014 E.C., Q2 – Kirchhoffs junction rule is a consequence of conservation of
  • 2013 E.C., Q1 – Kirchhoff's junction rule state that
  • 2013 E.C., Q4 – Which one of the following statement is correct about tangent galvanometer?
  • 2012 E.C., Q11 – Which of the following is true about galvanometer?
  • 2012 E.C., Q10 – According to Kirchhoff’s junction rule,
  • 2011 E.C., Q36 – The statement of Kirchoff's point rule follows from:
  • 2011 E.C., Q37 – Across the horizontal diagonal between the left and right junctions is a galvanometer labeled 'G' connected in series with a resistor labeled 'R4'.] = R 2 R 1 R 4 R 3
  • 2011 E.C., Q1 – Which part of a scientific report discusses the accuracy of measurements taken?
  • 2010 E.C., Q36 – Which of the following is correct about the characteristics of current and voltage in A.C circuits?
  • 2010 E.C., Q37 – An RLC circuit is designed to have a resistance of 400 ?, capacitive reactance of 350 ? and inductive reactance of 50 ?. The circuit is connected to an alternative voltage source of effective (rms) valve 50 v and frequen
  • 2010 E.C., Q39 – Bottom branch: from the bottom-left corner to the bottom-right corner, a horizontal resistor followed by a battery labelled 9V.]
  • 2010 E.C., Q30 – Which of the following statement is correct?
  • 2010 E.C., Q29 – A copper wire of cross sectional area $2\,\text{mm}^2$ carrying a current of $1.5\,\text{A}$. if the drift velocity of the electron is $0.00028\,\text{m/s}$, what is the number of charge carriers (free electrons) per uni
  • 2008 E.C., Q28 – Three resistors connected in series have individual voltages labelled, , and respectively. Which of the following expresses the value of the voltage taken over the three resistors together? T
  • 2007 E.C., Q34 – Bottom branch: a battery labelled 12 V on the left and a resistor labelled 9 on the right, with a 2 I 1 current arrow drawn beneath the resistor pointing to the LEFT and labelled .]
  • 2006 E.C., Q37 – If the terminals of a battery with zero internal resistance are connected across two identical resistors in series, the total power delivered by the battery is 8 W. if the same is connected across the same resistors in p
  • 2005 E.C., Q28 – The lower branch runs from A through a 12 ohm resistor to a point labelled D and then through a 6 ohm resistor to C.]
  • 2005 E.C., Q42 – Along the bottom wire, which returns to the battery, there is a resistor labelled G.]
  • 2005 E.C., Q38 – A series RLC circuit has a resistance of 45 and an impedance of 75 . What average power is delivered to this circuit when ?
  • 2005 E.C., Q14 – A 220-V power line is protected by a 15-A fuse. What is the maximum number of "220V, 500W" light bulbs that can be operated at full brightness from this line?
6.6 Capacitors and Capacitance · read p. 270
  • 2018 E.C., Q50 – A nonconducting material that is inserted between the plates of a capacitor is known as:
  • 2016 E.C., Q7 – Two capacitors having capacitances $C_1$ and $C_2$ are connected in series to a voltage source of potential difference $v$. If the total charge stored by the capacitors is $Q$, the total electrical energy stored by the c
  • 2016 E.C., Q36 – Two equal parallel plate capacitors are connected in parallel to a 10 V battery. When the space between the plates is air, each capacitor has a capacitance of 2 x 10 -12 F. If the space between the plates is completely f
  • 2016 E.C., Q31 – A capacitor with a capacitance of C is connected to an AC power supply producing a sinusoidal voltage of peak value v p and frequency f. The capacitive reactance (X c ) of the circuit is
  • 2015 E.C., Q5 – Four capacitors are connected in a capacitor network as shown in the figure below. The equivalent capacitance between terminals a and b in μF is
  • 2015 E.C., Q39 – In a simple a.c circuit, an inductor of 4μH and a capacitor of 9 pf are connected in series to each other and the combination is connected to an a.c source. What is the angular frequency at resonance of the circuit?
  • 2014 E.C., Q21 – A parallel plate capacitor is charged with a battery. The battery is thenm disconnected, and a dielectric material is inserted between the plates of the capacitor. Which of the following is correct about the effect of th
  • 2013 E.C., Q19 – When a dielectric material placed between two parallel metal plates in the presence of electric fields they enable the plates to store
  • 2011 E.C., Q43 – A series circuit consisting of resistor and capacitor of capacitive reactance are connected to alternating source of voltage(rms) 100V. What is the average power output and power factor of the circuit?
  • 2011 E.C., Q34 – A sheet of polythene ($\varepsilon_r = 2.3$) and 0.25 mm thick is to be used in a capacitor by sandwiching it between two sheets of aluminum foil. What area must the sheets have if the capacitor is to have a capacitance
  • 2010 E.C., Q28 – No label is legible beside the dot on the upper plate.]
  • 2008 E.C., Q33 – A positive charge of C is on the negatively charged plate of a parallel plate capacitor as shown below. If the potential(V) on the top plate is +10,000V and that of the bottom plate is -10,000V, how much work (w) is requ
  • 2007 E.C., Q31 – A parallel plate capacitor has a capacitance of $10\,\mu\mathrm{F}$. If the distance between the plates is doubled, keeping all other quantities constant, what is the new capacitance of the capacitor?
  • 2006 E.C., Q43 – Two different capacitors of capacitance and are connected in series across a 120V supply line. The charged capacitors are disconnected from the line and from each other, and reconnected with C 1 C terminals of like sign
  • 2006 E.C., Q7 – A capacitor made of parallel plates is charged by connecting it to a battery. The distance between the plates is much less than the surface area of each plate. After fully charged if the plates are disconnected from the
  • 2005 E.C., Q12 – An air-filled parallel-plate capacitor has a capacitance of 1Pf. The plate separation is then doubled and a wax dielectric is inserted, completely filling the space between the plates. As a result, the capacitance become
  • 2005 E.C., Q35 – What is the capacitance of a capacitor that should be connected with 2 other capacitors having capacitance of $4\,\text{F}$ and $8\,\text{F}$ all in series to produce an effective capacitance of $\frac{24}{11}\,\mu\text{
  • 2005 E.C., Q2 – Consider a series RC circuit for which , and . What is the time constant of the circuit and the maximum charge on the capacitor after the switch is closed respectively?
  • 2005 E.C., Q40 – Which one of the following changes to parallel plate capacitor would not increase energy stored in the capacitor at a fixed voltage across the plates?
6.7 Electric Circuits in Our Surroundings · read p. 280
Not asked in a national paper yet.