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Q.

Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value. The current through the component will:

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a

Remain same

b

Become half

c

Become twice

d

Become four times

answer is B.

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Detailed Solution

The current through the component will become half.
According to Ohm’s law, at a constant temperature, the current flowing through a component is directly proportional to the potential difference between its terminals, i.e.,

V α I

. if the potential difference increases, the current will increase and vice–versa. Here, the potential difference across the two ends of the component decreases to half. Hence, the current will also decrease to half of its former value.

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Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value. The current through the component will: