Physics Test 13...

A conducting circular loop is placed in a uniform magnetic field, B = 0.025 T with its plane perpendicular to the direction of magnetic field. The radius of the loop is made to shrink at a constant rate of 1 mm s^-1. Find the induced emf in the loop when it's radius is 2 cm.

A body executing S.H.M. has amplitude 5 cm and frequency 5 vibrations per second. Calculate the displacement of particle from mean position after 0.32 s.

For network shown in figure, determine V₀ and I_D. (Where, I_D = Current flowing in the diodes)

A particle is projected vertically upwards with a velocity u, from a point O. When it returns to the point of projection, which of the following is incorrect ?

Two blocks each of mass m,  lie on a smooth table. They are attached to two other masses as shown in figure. The pulleys and strings are light. An object O is kept at rest on the table. The sides AB and CD of the two blocks are made reflecting. The acceleration of two images formed in those two reflecting surfaces with respect to each other is

An electron is in an excited state in a hydrogen like atom. It has a total energy of  -3.4 eV. The kinetic energy is E and its de Broglie wavelength is λλ. Then

Two cylindrical rods of uniform cross-sectional area A and 2A, having free electrons per unit volume 2n and n respectively are joined in series. A constant current I flows through them in steady state. The ratio of drift velocity of free electrons in the left rod to that of the right rod is (VL/VR) is:

Uncharged capacitor of capacitance 4 μF4 and a resistance of 2.5 M ΩM Ω are connected in series with 12 V battery at t=0. Find the time after which the potential difference across the capacitor is 3 times the potential difference across the resistor. [Given, ln (2) = 0.693]

A refrigerator is to maintain the eatables, kept inside it, at 9^oC. The coefficient of performance of the refrigerator, if the room temperature is 36^oC, is

A ball is projected up an incline of 30o with a velocity of 30 ms⁻¹ at an angle of 30^o with reference to the inclined plane from the bottom of the inclined plane. If g = 10 ms⁻², then the range on the inclined plane is