HSC Science Class 12 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Physics

What is electromagnetic induction?

An electron moves on a straight-line path XY as shown in the figure. The coil abcd is adjacent to the path of the electron. What will be the direction of the current, if any, induced in the coil?

A thin semi-circular conducting ring (PQR) of radius r is falling with its plane vertical in a horizontal magnetic field B, as shown in the figure.

The potential difference developed across the ring when its speed v , is

State Lenz’s law.

State Fleming’s right-hand rule.

What for an inductor is used? Give some examples.

Establish the fact that the relative motion between the coil and the magnet induces an emf in the coil of a closed circuit.

Give an illustration of determining direction of induced current by using Lenz’s law.

Show that Lenz’s law is in accordance with the law of conservation of energy.

Obtain an expression for motional emf from Lorentz force.

A square coil of side 30 cm with 500 turns is kept in a uniform magnetic field of 0.4 T. The plane of the coil is inclined at an angle of 30° to the field. Calculate the magnetic flux through the coil.

A straight metal wire crosses a magnetic field of flux 4 mWb in a time 0.4 s. Find the magnitude of the emf induced in the wire.

The magnetic flux passing through a coil perpendicular to its plane is a function of time and is given by OB = (2t³ + 4t² + 8t + 8) Wb. If the resistance of the coil is 5 Ω, determine the induced current through the coil at a time t = 3 second.

A closely wound circular coil of radius 0.02 m is placed perpendicular to the magnetic field. When the magnetic field is changed from 8000 T to 2000 T in 6 s, an emf of 44 V is induced in it. Calculate the number of turns in the coil.

An induced current of 2.5 mA flows through a single conductor of resistance 100 Ω. Find out the rate at which the magnetic flux is cut by the conductor.

A coil of 200 turns carries a current of 4 A. If the magnetic flux through the coil is 6 x 10^-5 Wb, find the magnetic energy stored in the medium surrounding the coil.

A 50 cm long solenoid has 400 turns per cm. The diameter of the solenoid is 0.04 m. Find the magnetic flux linked with each turn when it carries a current of 1 A.

A coil of 200 turns carries a current of 0.4 A. If the magnetic flux of 4 mWb is linked with each turn of the coil, find the inductance of the coil.

Using Lenz’s law, predict the direction of induced current in conducting rings 1 and 2 when the current in the wire is steadily decreasing.

The speed of light in an isotropic medium depends on, ______.