Question

a wire of resistance r is recast and form a new wire of thickness double than the thickness what is the new resistance of the wire​

Answer 1

Answer:

As resistance is directly propotional to the length and inversly propotional to the area of the wire.. therefore by melting area doesnt decreases and as per question length becomes half.. so resistance decreases and becomes half of the initial resistance.

=》R1=rho l/a

=》R2=rho l/2a

By comparing both we get resistance becomes half.

Answer 2

Answer:

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Explanation:

double of it thickness