A. 100 N
B. 400 N
C. 600 N
D. 1000 N
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Related Mcqs:
- 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 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 - 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 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 - 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 - 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 - 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 - Reversing the field or the current will reverse the force on the conductor
A. Yes
B. No - An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is____________?
A. 20 Wb
B. 2 Wb
C. 0.2 Wb
D. 0.02 Wb - 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
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