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#### Question

A circular coil of 250 turns and diameter 18 cm carries a current of 12A. What is the magnitude of magnetic moment associated with the coil?

#### Solution

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The combined resistance of a galvanometer of resistance 500Ω and its shunt is 21Ω. Calculate the value of shunt.

Write the underlying principle of a moving coil galvanometer.

Two moving coil meters, M_{1} and M_{2} have the following particulars:

*R*_{1} = 10 Ω, *N*_{1} = 30,

*A*_{1} = 3.6 × 10^{–3} m^{2}*, **B*_{1} = 0.25 T

*R*_{2} = 14 Ω, *N*_{2} = 42,

*A*_{2} = 1.8 × 10^{–3} m^{2}, *B*_{2} = 0.50 T

(The spring constants are identical for the two meters).

Determine the ratio of (a) current sensitivity and (b) voltage sensitivity of M_{2} and M_{1}.

A rectangular coil of a moving coil galvanometer contains 50 turns each having area 12 cm2 . It is suspended in radial magnetic field 0.025 Wb/m^{2} by a fibre of twist constant 15 x10^{-10} Nm/degree. Calculate the sensitivity of the moving coil galvanometer.

A galvanometer of resistance *G* is converted into a voltmeter to measure upto *V* volts by connecting a resistance *R*_{1} in series with the coil. If a resistance *R*_{2} is connected in series with it, then it can measures upto *V*/2 volts. Find the resistance, in terms of *R*_{1} and *R*_{2}, required to be connected to convert it into a voltmeter that can read upto 2 V. Also find the resistance *G* of the galvanometer in terms of *R*_{1} and *R*_{2}