An emf of 16 volts is induced in a coil of inductance 4 H. The rate of change of current must be 4 A / s. 32 A / s. 64 A / s. 16 A / s. TRUE ANSWER : ? YOUR ANSWER : ?
An insulated metal sphere of 20 cm diameter is charged by rubbing with charges 2 × 10-8 C. Potential developed will be 0 V. 1800 V. 200 V. 900 V. TRUE ANSWER : ? YOUR ANSWER : ?
An open wire transmission line having a characteristic impedance of 600 ohms is terminated by a resistive load of 900 O. The standing wave ratio will be 1.5 2.5 4.5 3.5 TRUE ANSWER : ? YOUR ANSWER : ?
A plane wave magnetic field is represented by Bx = cos(y – ct). The electric and magnetic fields will be zero in the direction Ex = Ey = 0, Bx = By = 0. Ey = Ez = 0, By = Bz = 0. None of these. Ex = Ey = 0, By = Bz = 0. TRUE ANSWER : ? YOUR ANSWER : ?
In above problem the induced emf will be reduced to half if the conductor moves an angle of 60° to the direction of field. 75° to the direction of field. 45° to the direction of field. 30° to the direction of field. TRUE ANSWER : ? YOUR ANSWER : ?
Which antenna is a wideband antenna? Folded dipole None of these Marconi antenna Hertz antenna TRUE ANSWER : ? YOUR ANSWER : ?
A negative point charge q = - 40 nC is moving with velocity of 6 × 106 m/s in a direction specited by unit vector uy + 0.6 uz. Find the magnitude of force vector on the moving particle by the field B = 2 ux + 3 uy + 5 uz mT and E = 2 ux - 3 uy + 5 uz KV/m 1440 μN. 1144 μN. 144 μN. 244 μN. TRUE ANSWER : ? YOUR ANSWER : ?
Parabolic and lens antenna used at High frequency Medium frequency Microwave frequency Low frequency TRUE ANSWER : ? YOUR ANSWER : ?
For an inductor, current is proportional to voltage across the inductor. none of them. both (A) and (B). magnetic field. TRUE ANSWER : ? YOUR ANSWER : ?
A magnetic field B = 5 × 10-2 uz T exerts a force on 0.02 m conductor along the x-axis. The conductor carried a current of 5 mA in the – ux direction. What force must be applied to the conductor to hold it in position 5 × 10-5 uy N. 5 × 10-5 ux N. - 5 × 10-5 uy N. 5 × 10-5 uz N. TRUE ANSWER : ? YOUR ANSWER : ?