Midway between two equal and similar charges, a third equal and similar charge is placed, then this third charge will not be equilibrium. will move out of the field of influence of two charges. be in unstable equilibrium. remain in stable equilibrium. TRUE ANSWER : ? YOUR ANSWER : ?
If an electric current carrying coil is placed in a uniform magnetic field in the direction of magnetic induction, then the net force is finite but torque is zero. the net force and torque on the coil are both zero. the net force is zero but torque is finite. the net force and torque are both finite. TRUE ANSWER : ? YOUR ANSWER : ?
A square corner reflector is used in which of the following? Radio astronomy Point-to-point communication All of these TV broadcast TRUE ANSWER : ? YOUR ANSWER : ?
What is the value of magnetic vector potential due to an infinitesimally small current element, evaluated at infinite distance from it? Zero. Depends on strength of current element. Infinity. Unity. TRUE ANSWER : ? YOUR ANSWER : ?
The inductance of a long solenoid of length 1000 mm wound uniformly with 3000 turns on a cylindrical paper cable of 60 mm diameter is 3.2 µH. 3.2 mH. 32 mH. 3.2 H. TRUE ANSWER : ? YOUR ANSWER : ?
If in a 1 mF capacitor, an instantaneous displacement current of 1 A is to be established in the spaces between its plates then it is possible by applying 106 Amp. 106 Amp/sec. 106 volts. 106 volts/sec. TRUE ANSWER : ? YOUR ANSWER : ?
inductance (L2) in parallel without mutual coupling will be 10 mH. 15 mH. 5 mH. 20 mH. TRUE ANSWER : ? YOUR ANSWER : ?
When a single turn coil rotates in a uniform magnetic field at a uniform speed, the induced emf will be pulsating. alternating. none of these. steady. TRUE ANSWER : ? YOUR ANSWER : ?
A sphere of 20 cm radius contains electrical charge of density 2/(r sinθ) c/m3. What is the total charge contained within the sphere? 0.335/sinθ c. 0.335 C. None of above. 0. TRUE ANSWER : ? YOUR ANSWER : ?
The two windings of a transformer have an inductor of 2 H each. If mutual inductor between them is also 2 H, then none of these. it is a perfect transformer. turns ratio of the transformer is also two. transformer is an ideal transformer. TRUE ANSWER : ? YOUR ANSWER : ?