Question

# In a properly adjusted tangent galvanometer, the deflection for $$1 A$$ current is found to be $$30^o$$. Now the coil is turned through $$90^o$$ about the vertical axis, the deflection for the same current will be

A
60o
B
30o
C
90o
D
0o

Solution

## The correct option is D $$0^o$$The basic concept used here is that force in the coil increases as its angle of twist increases as $$F\propto \theta$$. Now this force in the spring will be balanced by the force due to magnetic field.Here the correct answer will be $${ 0 }^{ 0 }$$ because in case of $${ 90 }^{ 0 }$$ deflection when the current is passed there will be no more deflection since it is already been more that $${ 30 }^{ 0 }$$. Physics

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