Q.21. (a) What do you mean by "potential difference between two points” in a conductor?
Name a device that helps to maintain a potential difference across a conductor. What is its
unit?
(6) Name the instrument used to measure (i) electric current in a circuit, (ii) potential
difference between two points in a circuit.
(c) The resistance of a resistor is kept constant and the potential difference across its two
ends is decreased to half of its former value. State the change that will occur in the current
flowing through it.
(d) A given length of a wire is doubled on itself. By what factor does the resistance of the
wire change ?
SECTION R
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Answer:
potential is good conduct of electricity and conductor is wastage of electricity
Explanation:
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