In a region of uniform magnetic induction B = 10 ­^–2 tesla, a circular coil of radius 30 cm and resistance π² ohm is rotated about an axis which is perpendicular to the direction of B and which forms a diameter of the coil. If the coil rotates at 200 rpm the amplitude of the alternating current induced in the coil is -

In the figure shown here, the work done in the process ACBA is – 

A gas is compressed at a constant pressure of 50N/m² from a volume of 10m³ to a volume of 4 m³. Energy of 100J is then added to the gas by heating. Its internal energy is –

Figure shows a small wheel fixed coaxially on a bigger one of double the radius. The system rotates about the common axis. The strings supporting A and B do not slip on the wheels. If x and y be the distances travelled by A and B in the same time interval, then- 

For a transistor amplifier in common emitter configuration having load impedance of 1 kΩ (h_fe = 50 and h_oe = 25) the current gain is

A block of mass m is taken from A to B under the action of a constant force F. Work done by this force is– 

A body moves a distance of 10m along a straight line under the action of a force of 5N. If the work done is 25 J , the angle which the force makes with the direction of motion of the body is-

A greased block P may slide along any of the three frictionless slopes A, B, or C, to reach the ground. The work done on the block by the block’s weight Mg, are W_A, W_B, and W_C for the three slopes respectively. Then- 

A particle is oscillating according to the equation X=7 cos 0.5 πt, where 't' is in second. The point moves from the position of equilibrium to maximum displacement in time-

The velocities of a particle in SHM at displacements x₁ and x₂from mean position are v₁ and v₂ respectively. Its amplitude will be -