Question

An electric wire of resistance 10 ohm is stretched to increase its length by 2 times. By what percentage will the resistance be increased??

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Answer 1

Answer:

14.4ohm

I hope it can help you

Answer 2

Answer:

❤_ GOOD MORNING SISTER _❤

The resistance of a wire can be expressed as R=

A

ρL

where,

ρ is the resistivity of the wire

L is the length of the wire

A is the area of cross section of the wire

In this case, the wire is stretched so as to increase its length by 20% i.e. factor of 1.2.

Here, the wire's cross-sectional area(CSA) reduces by factor of 1.2 times of its original value as volume of wire is constant.A 1 L 1

=A 2 L 2A 2

= 1.2A 1R 2

= A 2ρL 2

= 1.2A 1

ρ1.2L 1R 2

=1.44 A 1ρL 1

=1.44×10=14.4

Hence, the new resistance is 14.4 ohms.

❤_ TO DAY MY BIRTHDAY PAGAL _❤