Current Electricity 5

A positively charged metal sphere is placed midway between two previously uncharged metal

rods, one of which is connected to earth.

Which diagram shows the charges on the rods?

• A

• B

• C

• D

The diagram shows a circuit.

The reading on the ammeter is 12 A.

How much charge passes through the ammeter in 2.0 minutes?

• 0.10 C

• 6.0 C

• 24 C

• 1440 C

A copper wire has a resistance of 2.0 Ω.

A second copper wire is twice as long as the first wire, and its diameter is twice the diameter of the first wire.

What is the resistance of the second wire?

• 1.0 Ω

• 2.0 Ω

• 8.0 Ω

• 16.0 Ω

In the circuit shown, the voltmeter reads 2.0 V. A charge of 5.0 C passes through the resistor in a certain time.

How much energy is supplied to the resistor in this time?

• 0.40 J

• 2.5 J

• 10 J

• 20 J

A polythene rod is rubbed with a cloth. The rod becomes positively charged because of the movement of charged particles.

Which row gives the name of these charged particles, and the direction in which they move?

• A

• B

• C

• D