NEET Physics Current Electricity Questions Solved


A wire of radius r has resistance R. If it is stretched to a radius of 3r4, its resistance becomes 

(1) 9R16

(2) 16R9

(3) 81R256

(4) 256R81

(4) R1R2=r2r14

RR2=3r/4r4=81256=R2=25681R 

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