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Q.

Two long parallel wires are separated by a distance of 12cm carry electric currents of 2A and 4A. The distance of null point from the conductor carrying larger current when currents are flowing in the opposite direction is

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a

4cm

b

16 cm

c

12 cm

d

24 cm

answer is D.

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Detailed Solution

Currents are in opposite direction location of null point from larger current i1=2A;  i2=4A; r=12cm x=ri1i2−1=1224−1=24cm
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