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Q.

Two similar coils of radius R are lying concentrically with their planes at angles to each other. The currents flowing in them are I and 2l respectively. The resultant magnetic field induction at the centre will be :

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a

μ0I2R

b

μ0IR

c

5μ0I2R

d

3μ0I2R

answer is C.

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B=B12+B22=μ0I2R2+μ02I2R2=5μ0I2R
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