A. ωB/r22-r12/Δt
B. ωB(r2-r1)2/Δt
C. ωB(r22-r12)/Δt
D. ωB(r22+r12)/Δt
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Related Mcqs:
- 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...
- The emf induced in a coil by a changing magnetic flux may have unit as______________?
- A. ms-1A B. ms-2A-1 C. kgms2A-1 D. kgm2s-1A-1...
- 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...
- 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...
- 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...
- In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will_____________?
- A. increase B. decrease C. remain the same D. initially increase and then decrease...
- 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...
- Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla
- A. 100 N B. 400 N C. 600 N D. 1000 N...
- A small coil lies inside a large coil. The two coils are horizontal concentric and carry currents in opposite directions. The large coil will experience______________?
- A. A torque about horizontal axis B. A torque about vertical axis C. An upward force along the axis D. No resultant force...
- 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...
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