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Q.

Statement - I : In a meter bridge, If its wire is replaced by another wire having same length, made of same material but having twice the cross sectional area, the accuracy decreases
Statement - II If wire of meter bridge is replaced by another wire of same material having same cross- sectional area but of twice the length, accuracy remains same.

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a

Both statements I and II are incorrect

b

Both statements I and II are correct

c

Statement-I is incorrect and statement-II is correct

d

Statement-I is correct and statement-II is incorrect

answer is D.

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Detailed Solution

The accuracy of the meter bridge is directly proportional to area of cross section of its wire and inversely proportional to length of the wire. 

So when area is doubled, accuracy increases and when length is doubled accuracy decreases

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Statement - I : In a meter bridge, If its wire is replaced by another wire having same length, made of same material but having twice the cross sectional area, the accuracy decreasesStatement - II If wire of meter bridge is replaced by another wire of same material having same cross- sectional area but of twice the length, accuracy remains same.