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Question: In a meter bridge circuit as shown in figure, the bridge is balanced when AJ = 20 cm. On interchangi...

In a meter bridge circuit as shown in figure, the bridge is balanced when AJ = 20 cm. On interchanging P and Q the balance length shifts by -

A

Zero

B

80 cm

C

40 cm

D

60 cm

Answer

60 cm

Explanation

Solution

If = 2080\frac { 20 } { 80 }

Now if P & Q are interchanged

QP\frac { \mathrm { Q } } { \mathrm { P } } = 8020\frac { 80 } { 20 } The balanced point shifts by 60 cm.