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Q.

A tangent galvanometer shows no deflection when a current is passed through it. But when the current is reversed, it gives a deflection of 1800; then the plane of the coil should have been oriented:

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a

at angle 60° the magnetic meridian

b

normal to magnetic meridian

c

in the magnetic meridian

d

at 45° to the magnetic meridian

answer is B.

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Detailed Solution

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When plane of coil is 900 to the magnetic meridian, the magnetic field due to it is parallel to magnetic meridian. Hence, it shows zero and 1800 deflections in the two current directions (forward and reversed).

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