Three charged balls, P, Q and R are suspended by insulating threads. Ball P is negatively charged. (See diagram)
What are the charges on ball Q and on ball R?
A ball Q = positive; ball R = positive
B ball Q = positive; ball R = negative
C ball Q = negative; ball R = positive
B ball Q = negative; ball R = negative
Which copper wire would have the smallest resistance?
A a long, thick wire
B a long, thin wire
C a short, thick wire
D a short, thin wire
In which unit is potential difference measured?
A ampere
B ohm
C volt
D watt
Which material is a conductor of electricity?
A brass
B glass
C plastic
D wood
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