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Q.

A tangent galvanometer shows no deflection when a current is passed through it, but when the current through it is reversed it gives a deflection of 180°, then the plane of the coil is

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a

at an angle of 60° to the magnetic meridian

b

at an angle of 45° to magnetic meridian

c

in the magnetic meridian

d

normal to the magnetic meridian

answer is B.

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Detailed Solution

If plane of coil in merdial both B and BH are perpendicular neddle shows deflection. If plane
of coil is perpendicular to merians both B and BH in same direction if current changes its directions changes

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