Physics Past Questions and Answers

A circuit has an area of 0.4m² and consists of 50 loops of wire. If the loops are twisted and allowed to rotate at a constant angular velocity of 10 rad s^-1 in a uniform magnetic field of 0.4T, the amplitude of the induced voltage is

The force on a charge moving with velocity v in a magnetic field B is half of the maximum force when the angle between v and B is

The maximum kinetic energy of the photoelectron emitted from a metal surface is 0.34eV. If the work function of the metal surface is 1.83eV,find the stopping potential.

When an alternating current given by I = 10sin (120π)t passes through a 12Ω resistor, the power dissipated in the resistor is

In a semi conductor junction diode, as the depletion or barrier layer is forward-biased, the layer