A magnetic compass will be deflected if it is kept near a:
Correct answer: B. Charge in motion
- A. Charge at rest
- B. Charge in motion
- C. Positive charge at rest
- D. None of them
Explanation
A magnetic compass will be deflected if it is kept near a charge in motion. Electric charges in motion constitute an electric current, which generates a magnetic field according to Ampère's law. This magnetic field can deflect the needle of a magnetic compass. Electric charges at rest do not generate a magnetic field that can interact significantly with a magnetic compass. Therefore, the correct answer is Charge in motion.
Last updated
About Electromagnetic Induction
Changing magnetic flux induces an emf according to Faraday's law, while Lenz's law gives the direction that opposes the change producing it. Transformers apply induction between coils to step alternating voltage up or down, with turns ratio, current transformation and energy losses determining practical operation.
Practise Electromagnetic Induction
288 free Electromagnetic Induction MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
A 25 wattand 100 watt bulbs are joined in series and connected to the mains.Which bulb will glow brighter?
A 50 mH coil carries a current of 2A. The energy stored in its magnetic field is:
A.C generator is a device which converts:
A.C is converted into D.C by:
A coil has an inductance of 0.02 Henry. When a current in the coil is changing at the rate of 150 A/S then the induced emf will be: