Which of the following statements are correct?

A. The relative motion between a magnet and a coil is responsible for induction of electric current in the coil.
B. Magnetic flux is a vector quantity.
C. In a closed coil, the magnitude of emf induced is equal to the time rate of change of magnetic flux.
D. Eddy currents oppose the magnetic braking effect in trains.
E. Lenz's law gives the polarity of the induced emf clearly.

Choose the correct answer from the options given below:

A, C and E only

The correct answer is Option (4) → A, C and E only

(A) According to Faraday's law of electromagnetic induction, emf induced is proportional to rate of change in magnetic flux.

(C) According to Faraday's law,

$|emf|=\left|\frac{d\phi}{dt}\right|$

(E) Lenz's law clearly states that the direction (polarity) of the induced emf is such that it opposes the charge in magnetic flux.