Energy stored in a magnetic field is given by______________?

Related Mcqs:

1. Lagging of changes in the magnetization of a substance behind changes in the magnetic field as the magnetic field is varied is known as magnetic_____________?

   A. Retaintivity B. Permeability C. Flux D. Hysteresis...

2. An electric current induced within the body of a conductor when that conductor either moves through a non uniform magnetic field or in a region where there is a change in magnetic flux is called_____________?

   A. Induced current B. Eddy current C. Back emf D. None of the above...

3. Current produced by moving the loop of wire across a magnetic field is called_____________?

   A. A.C current B. D.C current C. induced current D. mean square current...

4. Which of the following works on torque on the current carrying conductor placed in magnetic field ?

   A. galvanometer B. ammeter C. voltmeter D. all of the above...

5. The emf induced in a conductor of unit length moving with unit velocity at right angles to a magnetic field is equal to_____________?

   A. Magnetic flux density B. Torque C. Mutual induction D. Motional emf...

6. A coil of wire is arranged with its plane perpendicular to a uniform magnetic field o flux density B. when the radius of the coil increases from r1 to r2 in time Δt then what is the emf induced in the coil ?

   A. ωB/r22-r12/Δt B. ωB(r2-r1)2/Δt C. ωB(r22-r12)/Δt D. ωB(r22+r12)/Δt...

7. An aeroplane of wingspan 10m flies from the equator towards the North Pole. The wings are perpendicular to the vertical component of the earths magnetic field (B = 4×10-5T). At maximum speed an emf of 96mV is induced across the wing tips. The maximum speed of the aeroplane is____________?

   A. 150msec-1 B. 384msec-1 C. 38.4msec-1 D. 200msec-1...

8. A metal rod of 25 cm length is moving at a speed of 0.5/sec in direction perpendicular to 0.25T magnetic field. Emf produced in the rod is_____________?

   A. 0 volt B. 3.125 volt C. 31.25 volt D. 0.03125 volt...

9. A conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 tesla. The force on the conductor will be nearly______________?

   A. 50 N B. 120 N C. 240 N D. 480 N...

10. A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be____________?

    A. 10 V B. 15 V C. 25V D. 50V...