If the number of flux passing through a coil per unit time is doubled then the motion emf?
Correct answer: C. Doubles
- A. Halves
- B. Triples
- C. Doubles
- D. Remains unchanged
Explanation
According to Faraday's Law of Electromagnetic Induction, the induced electromotive force (EMF) in a coil is equal to the rate of change of magnetic flux through the coil. Mathematically, this is expressed as emf = ΔØ/Δt. If the magnetic flux passing through the coil per unit time is doubled, the rate of change of flux is also doubled, hence the induced EMF doubles. Therefore, Option C is correct. The other options are incorrect because they misinterpret the relationship between flux change and induced EMF. Halving or tripling the EMF would require corresponding changes in the flux rate, which doesn't align with the scenario described in the question.
Last updated
About Faraday's Law
Faraday's law states that an induced electromotive force equals the rate of change of magnetic flux linkage through a circuit. Questions cover changing field, area, angle or motion, the negative sign associated with Lenz's law, and the distinction between induced emf and the current that may flow in a closed circuit.
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 bar magnet is held stationary inside a coil. The induced emf in the coil is
A coil of 150 loops is pulled in 0.06s from poles of the magnet, which decreases the magnetic flux linked with the coil from 6 x 10^-4 Wb to 2 x 10^-4 Wb. The average emf induced in the coil is:
A conductor of length L is moved across a magnetic field. Due to this activity, a potential difference appears across the ends of the conductor. This type of potential difference is termed as:
A copper hoop is held ina vertical east-west plane in a uniform magnetic field whose field lines run along the north-south direction. The largest induced emf is produced when the hoop is.
A current generator is a device that converts: