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qUESTIONS

Magnetic field at a distance 2.4 cm from a long straight wire is 16 µT. What must be current through the wire?

The magnetic field at the centre of a circular current carrying loop of radius 12.3 cm is 6.4 × 10-6 T. What is the magnetic moment of the loop?

A circular coil of wire consisting of 100 turns, each of radius 8.0 cm carries a current of 0.40 A. What is the magnitude of the magnetic field B at the centre of the coil?

For proton acceleration, a cyclotron is used in which a magnetic field of 1.4 Wb/m2 is applied. Find the time period for reversing the electric field between the two Ds.

A moving coil galvanometer has been fitted with a rectangular coil having 50 turns and dimensions 5 cm × 3 cm. The radial magnetic field in which the coil is suspended is of 0.05 Wb/m2 . The torsional constant of the spring is 1.5 × 10-9 Nm/ degree. Obtain the current required to be passed through the galvanometer so as to produce a deflection of 30°.

A toroid of narrow radius of 10 cm has 1000 turns of wire. For a magnetic field of 5 × 10-2 T along its axis, how much current is required to be passed through the wire?

A solenoid of length π m and 5 cm in diameter has winding of 1000 turns and carries a current of 5 A. Calculate the magnetic field at its centre along the axis.

In a cyclotron protons are to be accelerated. Radius of its D is 60 cm. and its oscillator frequency is 10 MHz. What will be the kinetic energy of the proton thus accelerated? (Proton mass = 1.67 × 10-27 kg, e = 1.60 × 10-19 C, 1eV = 1.6 × 10-19 J)

A wire loop of the form shown in the figure carries a current I. Obtain the magnitude and direction of the magnetic field at P.

Figure shows a section of a very long cylindrical wire of diameter a, carrying a current I. The current density which is in the direction of the central axis of the wire varies linearly with radial distance r from the axis according to the relation J = J0 r/a. Obtain the magnetic field B inside the wire at a distance r from its centre.

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