Magnetism and Electromagnetism | Practice MCQs Physics for Mdcat | mosaicbro.com
Magnetism and Electromagnetism | Practice MCQs Physics for Mdcat
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Review Answers:
120
The phenomenon in which a change of current in one coil produces an induced emf in another coil nearby is called:
Correct Answer:C
Explanation:
Mutual induction involves two coupled coils.
121
A force of 5 N is acting on a wire of length 1 m, held perpendicular in a uniform magnetic field of strength 5 web/m² then the value of current passing through it will be:
Correct Answer:C
Explanation:
$I = F/(BL) = 5/(5 \times 1) = 1$ A.
122
The particle which cannot be deflected in a magnetic field is:
Correct Answer:D
Explanation:
Neutrons are neutral and unaffected by magnetic fields.
123
A particle of charge ‘q’ and mass ‘m’ moving with a velocity ‘v’ enters perpendicularly in a uniform magnetic field ‘B’ describes a circular path. What will be the radius of that path?
Correct Answer:A
Explanation:
Radius $r = mv/(qB)$.
124
240 KW electric power is sent to an area 20 km away from the power plant. If the transformer lines have total resistance of 5 Ohm, then $24 \times 10^5$ volts, the power loss will be:
Correct Answer:A
Explanation:
Power loss $P_{\text{loss}} = I^2R = (P/V)^2 R = (240000/240000)^2 \times 5 = 200$ W.
125
If a certain transformer having 200 turns in its primary coil converts 11000 voltage to 220 volts for domestic purpose then the number of turns in secondary coil should be: