Questions
The seave of a galvanometer of resistance 100 contains 25 divisions. It gives a deflection of 1 division on passing a current of 4 x 10-4 A. The resistance in ohm to be added to it, so that it may become a voltmeter of range 2 .5 V is
detailed solution
Correct option is B
For full scale deflection , ig = n k∴ ig=25×4×10−4=10−2ANow R=Vig−G=2⋅510−2−100=250−100=150ΩTalk to our academic expert!
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A tangent galvanometer has a coil with 50 turns and radius equal to 4 cm. A current of 0.1 amp is passing through it. The plane of the coil is set parallel to the earth's magnetic meridian. If the value of the earth's horizontal component of the magnetic field is 7x 10-5 Tesla and weber/amp' x metre, then the deflection in the galvanometer needle will be
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