Question

when a potential difference of 2V is applied across the ends of a wire of 5m length , a current of 1A is found to flow through it.

•||••||CALCULATE||••||•

(i) the resistance per unit length of the wire.
(ii) the resistance of 2m length of the wire.
(iii) the resistance across the ends of the wire if it is double on itself.

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Answer 1

Answer:

(i) 2 ohm

(ii) 2 ohm

(iii) increases 10 times

Explanation:

${\bold{\large{\boxed{\green{Given}}}}}$

• (Potential difference) v - 2V
• length of the wire (l) - 5m ~ 500 cm
• current (i) - 1 A

(i)

${\bold{\large{\boxed{\pink{V=IR}}}}}$

$2 = 1 \times R \: \\ R = 2 \: ohm$

(ii) As resistance does not depends upon the length of the wire it will remain same 2ohm

(iii) As the length of the given wire is directly proportional to the resistance of that wire so,

resistance will increase 10 times.

Answer 2

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