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A wire  has a resistance of . Another wire  of same material but length twice that of  has resistance of . If  is the radius of cross-section of , the radius of cross-section of is

a)

b)

c)

d)


Question ID - 150504 | Toppr Answer

A wire  has a resistance of . Another wire  of same material but length twice that of  has resistance of . If  is the radius of cross-section of , the radius of cross-section of is

a)

b)

c)

d)

1 Answer - 5876 Votes

3537

Answer Key : (c) -

(c)

Resistance, R

For wire P, 

Similarly for wire Q,

Dividing Eq.(i) by Eq. (ii), we have



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