ISRO Scientist or Engineer Electrical 2015 Question 1

Question 1

The current I em units, flowing in a coil of a tangent galvanometer is given by the expression where
r = Mean radius of the galvanometer coil.
N = Numberof turns of the galvanometercoil.
H = Horizontal componentof earth magneticfield.
$$\phi$$ = Deflection of galvanometer magnetic needle.

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