The electric flux through a closed gaussian surface depends upon (A) Permittivity of the medium. (B) Net charge enclosed only. (C) Net charge enclosed and permittivity of the medium. (D) Net charge enclosed, shape and size of the Gaussian surface and permittivity of the medium.

The locus of all particles in a medium, vibrating in the same phase is called (a) wavelet. (b) fringe. (c) wave front. (d) None of these.

The magnetic flux linked with a coil is

The self inductance of long solenoid cannot be increased by (a) increasing its area of cross section (b) increasing its length (c) changing the medium with grater permeability (d) Increasing the current through it.

The SI unit of inductance is the henry. It can be written as (a) weber/ampere (b) volt-second/ampere (c) joul/(ampere)² (d) ohm-second

There is a uniform magnetic field directed perpendicular and into the plane of the paper. An irregular shaped conducting loop is slowly changing into a circular loop in the plane of the paper. Then, (a) Current is induced in the loop in the anti-clockwise direction (b) Current is induced in the loop in clockwise direction (c) AC Current is induced in the loop (d) No current is induced in the loop

To convert a moving coil galvanometer into on ammeter of given range, we must connect: (a) A suitable low resistance in series (b) A suitable low resistance in parallel (c) A suitable high resistance in parallel (d) A suitable high resistance in series

Twenty-seven drops of mercury are charged simultaneously to the same potential of 10 volts. What will be potential if all the charged drops are made to combine to form one large drop ? (a) 180 V (b) 90 V (c) 120 V (d) 45 V

Two anti-parallel conducting wires carrying currents in the ratio 2:3. What is the nature of the force acting between them? a) Attractive b) Repulsive c) Both attractive and Repulsive d) can not predict.

Two cables of copper are of equal lengths. One of them has a single wire of area of cross- section A, while other has 10 wires of cross-sectional area A/10 each. Give their suitability for transporting A.C. and D.C. (a) only multiple strands for A.C., either for D.C. (b) only multiple strands for A.C., only single strand for D.C. (c) only single strand for D.C., either for A.C. (d) only single strand for A.C., either for D.C.

Two capacitors of capacitance 6 µF and 4 µF are put in series across a 120 V battery. What is the potential difference across the 4 µF capacitor? (a) 72 V (b) 60 V (c) 48 V (d) zero

Two conducting spheres of radii \(r^1\) and \(r^2\) are equally charged. The ratio of their potential is (a) (\(r^1\)/\(r^2\))² (b) (\(r^1\)\(r^2\))² (c) (\(r^1\)/\(r^2\)) (d) (\(r^2\)/\(r^1\)) ​

Two copper spheres of the same radius, one solid and the other hollow, are charged to the same potential. Which will have more charge? (a) Solid sphere (b) Hollow sphere (c) Both will have an equal charge (d) None of these

Two sources of light are said to be coherent when both give out light waves of the same: (a) amplitude and phase. (b) intensity and wavelength. (c) speed. (d) wavelength and a constant phase difference.

Two wires of same length are shaped into a square and a circle. If they carry same current, the ratio of their magnetic moment- a) 2:π b)π:2 c) 4:π d) π:4.