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
Electromagnetic Induction
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____________?
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
Two 300 uH coils in series without mutual coupling have a total inductance of___________?
Two 300 uH coils in series without mutual coupling have a total inductance of___________?
A. 300 uH
B. 600 uH
C. 150 uH
D. 75 uH
Which of the fpllowing inductor will have the least eddy current losses ?
Which of the fpllowing inductor will have the least eddy current losses ?
A. Air core
B. Laminated iron core
C. Iron core
D. Powdered iron core
A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage ?
A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage ?
A. 0.01 s
B. 0.1 s
C. 0.5 s
D. 5 s
A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is_____________?
A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is_____________?
A. 50 ohms
B. 500 ohms
C. 1000 ohms
D. 5000 ohms
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 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
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 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
Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be_____________?
Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be_____________?
A. 6 H
B. 8 H
C. 12 H
D. 24 H
Lenz’s law is a consequence of the law of conservation of__________?
Lenz’s law is a consequence of the law of conservation of__________?
A. induced current
B. charge
C. energy
D. induced e.m.f.