A rectangular coil lies flat on a horizontal surface. A bar magnet is held at re

Question

A rectangular coil lies flat on a horizontal surface. A bar magnet is held at rest above the center of the coil with its north pole pointing down. What is the direction of the induced current in the coil? A) There is no current in the coil. B) clockwise C) counterclockwise D) Not enough information is provided. Answer: A 5) In an electromagnetic wave the E and B fields are oriented such that A) they are parallel to one another and perpendicular to the direction of wave propagation. B) they are parallel to one another and parallel to the direction of wave propagation. C) they are perpendicular to one another and perpendicular to the direction of wave propagation. D) they are perpendicular to one another and parallel to the direction of wave propagation. E) None of the above answers is correct. Answer: C

Explanation / Answer

1) Current = Emf induced / R .....R = Resistance

Emf induced = E = -d(phi)/dt

where, phi is the flux passing through coil

As, bar magnet is at rest so, flux is constant

E = 0 (as flux is constant)

So, current is zero

2) In electromagnetic wave, electric field, magnetic field and direction of propagation are perpendicular to each other...always

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