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qUESTIONS

Textbook-Solutions-12th-MH

The region inside a current carrying torrid winding is filled with aluminium having susceptibility χ=2.3 x 10-5. what is the percentage increase in the magnetic field in the presence of aluminium over that without it?

Textbook-Solutions-12th-MH

Calculate the gyromagnetic ratio of electron (given e=1.6×10-19 C, mc=9.1×10-31 kg)

A toroidal ring, made from a bar of length (l) 1 m and diameter (d) 1 cm, is bent into a circle. It is wound tightly with 100 turns per cm. If the permeability of bar is equal to that of free space (Uo), calculate the magnetic field inside the bar (B) when the current (i) circulating through the turns is 100 A. Also determine the self-inductance (L) of the coil.

The primary and secondary coil of a transformer each have an inductance of 200 ×10-6 H. The mutual inductance (M) between the windings is 4×10-6 H. What percentage of the flux from one coil reaches the other?

A uniform magnetic field B(t), pointing upward fills a circular region of radius, s in horizontal plane. If B is changing with time, find the induced electric field.

A long solenoid of length l, cross-sectional area A and having N1 turns (primary coil), has a small coil of N2 turns (secondary coil) wound about its centre. Determine the Mutual inductance(M) of the two coils.

The value of mutual inductance of two coils is 10 mH. If the current in one of the coil changes from 5A to 1A in 0.2 s, calculate the value of emf induced in the other coil. Also calculate the value of induced charge passing through the coil if its resistance is 5 ohm.

Calculate the value of induced emf between the ends of an axle of a railway carriage 1.75 m long travelling on level ground with a uniform velocity of 50 km per hour. The vertical component of Earth’s magnetic field (Bv) is given to be 5×10-5T.

A stiff semi-circular wire of radius R is rotated in a uniform magnetic field B about an axis passing through its ends. If the frequency of rotation of wire be f, calculate the amplitude of alternating emf induced in the wire.

An aircraft of wing span of 50 m flies horizontally in earth’s magnetic field of 6×10-5T at a speed of 400 m/s. Calculate the emf generated between the tips of the wings of the aircraft.

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