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3.12. A rectangular coil of wire is suspended in a uniform radial magnetic field of induction...

3.12. A rectangular coil of wire is suspended in a uniform radial magnetic field of induction 0.05 T, the field lines being horizontal. The coil consists of 400 turns of wire each of height 2 cm and width 1 cm. If a current of 1 mA is passed through the coil, calculate:-

(a) the force acting on unit length of the wire in one of the vertical sides of the coil;

(b) the total force on one vertical side of the coil;

(c) the total force on one horizontal side of the coil,

(d) the torque experienced by the coil.

If the suspension is elastic and a torque of 10-5 Nm is required to produce an angular displacement of one radian, find the angular displacement of the coil due to a current of 1 mA. Draw neat diagrams in order to clarify the results obtained in the above parts.

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