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Question
The area of the coil in a moving coil galvanometer is 80 cm2 and it has 200 turns. The magnetic induction of the radial field is 0.2 T and the couple per unit twist of the suspension wire is 2×10−6Nm per degree. If the deflection is 4, the current passing through it is
The area of the coil in a moving coil galvanometer is 80 cm2 and it has 200 turns. The magnetic induction of the radial field is 0.2 T and the couple per unit twist of the suspension wire is 2×10−6Nm per degree. If the deflection is 4, the current passing through it is
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Solution
The correct option is D 0.025 mA
Couple per unit twist = 2×10−6N/M
deflection = 4
= Total couple = 8×10−6
J = ni AB
8×10−6=200×80×10−4×0.2×i
i=2.5×10−4A
Couple per unit twist = 2×10−6N/M
deflection = 4
= Total couple = 8×10−6
J = ni AB
8×10−6=200×80×10−4×0.2×i
i=2.5×10−4A
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