Physics Test - ...

If a coil of 40 turns and area 4.0 cm² is suddenly removed from a magnetic field, it is observed that a charge of 2.0 × 10^-4C flows into the coil. If the resistance of the coil is 80Ω, the magnetic flux density inWbm-2is.......

Two coherent point sources S1 and S2 are separated by a small distance d as shown. The fringes obtained on the screen will be :

In the circuit shown, a potential difference of 60 V is applied across AB. The potential difference between the points M and N is

Two photons of same frequencies moving in same medium have

A coil having n turns and resistance R Ω is connected with a galvanometer of resistance 4R Ω. This combination is moved magnetic field in time t  so that magnetic flux changes from W1 wb to W2 wb. The induced current in the circuit is

In a full wave rectifier circuit operating from 50 Hz mains frequency, the fundamental frequency in the rectifier wave would be

If the resistivity of an alloy is ρ′ and that of constituent metal is ρ then

A circular disc of radius 0.2 meter is placed in a uniform magnetic field of induction $\frac{\mathrm{1/}}{\pi }\text{Wb}{\text{m}}^{}$⁻² in such a way that its axis makes an angle of 60^o with $\underset{B}{\to }$$\stackrel{}{}$.The magnetic flux linked with the disc is

Two bodies of identical mass m are moving with constant velocity v but in the opposite directions and stick to each other, the velocity of the compound body after collision is