Physics Practice Test – Current Electricity and Electric Charges

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A negatively charged rod is brought near the cap of a gold-leaf electroscope. The cap is earthed momentarily while the rod is near to it. The rod is then removed. Which of the following is correct?

A. The cap will be positively charged and the negatively charged leaves will diverge.
B. The cap will be negatively charged and the positively charged leaves will diverge
C. The cap and the leaves will be positively charged.
D. The cap and the leaves will be negatively charged.

A positively charged glass rod is placed near the cap of a positively charged electroscope. The divergence of the leaf is observed to ________

A. decreases     B. increases     C. remain the same     D. increase and collapse immediately.

A dry plastic comb used in combing hair was found to attract pieces of paper and dust. The most probable explanation for this phenomenon is that the comb has been given ______

A. magnetization by induction
B. electric charges by induction
C. electric charges by conduction
D. electric charges by friction

Calculate the current I in the circuit above.

A. 0.60 A     B. 0.97 A     C. 1.03 A     D. 5.00 A

A cell of e.m.f. 1.5 V and internal resistance 1.0 Ω is connected to two resistors of resistances 2.0 Ω  and 3.0 Ω in series. Calculate the current through the resistors.

A. 0.25 A     B. 0.30 A     C. 0.35 A     D. 0.50 A

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