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Form 3 Electrostatics II Physics Questions and Answers

Form 3 Electrostatics II Physics Questions and Answers

Lessons (20)

• 1.    The figure below shows two parallel plates of a capacitor separated by a distance d. Each plate has an area of A square units. Suggest two adjustments that can be made so as to reduce the effective capacitance.
  1m 5s

• 2.    In some petrol engines where spark plugs are used, a capacitor is connected to the distributor. Suggest the function of the capacitor.
  0m 55s

• 3.    Figure 5 below shows two charged identical conducting spheres on insulating stands. Each cross represents a charge. The spheres are briefly brought into contact and then separated. Sketch the diagrams of the spheres showing charge distribution after separation.
  0m 54s

• 4.    The figure below shows part of a circuit containing 3 capacitors. Write an expression for CT the effective capacitance between A and B.
  3m 33s

• 5.    The figure below shows part of a circuit containing two capacitors of 2micro Faraday and 3 micro Faraday respectively. Determine the p.d across AB given that the total charge in the capacitors is #1 times 10^-4# coulombs.
  2m 28s

• 6.    The figure below shows three capacitors connected between two points A and B. Determine the capacitance across AB.
  2m 23s

• 7.    The capacitors in the circuit in the figure below are identical and initially uncharged. Switch S1 is closed while switch S2 remains open. After sometime, switch S1 is opened and switch S2 closed. Determine the final reading of the voltmeter, V.
  2m 59s

• 8.    The figure below shows a circuit for charging and discharging a capacitor c, through a variable resistor R. X, Y and T are points on two-way switch. Explain how the charging processes are achieved.
  1m 25s

• 9.    The table below shows the variation of the charge Q with time t when 500 micro Faraday capacitor was discharged through a resistor. a).Plot a graph of charge against time. b).Determine the current flowing in the circuit at t= 30s. (Give your answer to 1 decimal place.).
  10m 32s

• 10.    The figure below shows a battery of e.m.f 3.0V connected in series with two capacitors. Determine the charge stored in the combined capacitors when the switch S is closed.
  1m 44s

• 11.    The figure below shows a sharp pin fixed on a cap of leaf electroscope. The electroscope is highly charged and then left for some time. Explain why the leaf collapses.
  0m 42s

• 12.    The figure below is a resistor-capacitor circuit. At time t = 0, the switch is closed at A for some time, and then opened. The switch is then closed at B.On the axes provided, sketch the graph of voltage V across the capacitor against time.(t1 and t2 represents times for opening at A and closing at B respectively).
  1m 46s

• 13.    In the circuit diagram shown below, each cell has an e.m.f of 1.5V and internal resistance of 0.5 ohms. The capacitance of each 1.4 micro faraday. When the switch S is closed determine the: i).ammeter reading ii).charge on each capacitor.
  4m 0s

• 14.    A metallic body shaped as shown in the figure below is positively charged and insulated from the ground as shown in the figure. On the diagram show the charge distribution
  0m 50s

• 15.    The figure below shows a circuit of e.m.f 4.5V, switches A and B, two capacitors C1 = 0.3 micro Faraday and C2 = 0.5 micro Faraday and a voltmeter are connected a).Determine the charge on C1 when switch A is closed and switch B is open. b) What is the effective capacitance CT when both switches A and B are closed? (c) State what is observed on the voltmeter when (i) Switch A is closed and switch B
  4m 50s

• 16.    The figure below shows a pair of parallel plates of a capacitor connected to a battery. The upper plate is displaced slightly to the left. State with a reason the effect of this movement on the capacitance
  0m 57s

• 17.    Light from a lamp falls on the cap of a negatively charged electroscope. It is observed that the divergence of the leaf decreases. Explain this observation.
  0m 56s

• 18.    State the effect of decreasing the distance between the plates of parallel plate capacitor on the capacitance.
  0m 41s

• 19.    State three factors that affect the capacitance of parallel plate capacitor.
  0m 31s

• 20.    Explain what is observed when an uncharged sphere is brought to positively charged electroscope.
  0m 32s