Question

A coil is suspended around an axis which is colinear with the axis of a bar magnet.
The coil is connected to a resistor with ends labeled “a” and “b”. The bar magnet moves from left to right with North and South poles labeled as in the figure. UseLenz’s law to answer the following question concerning the direction of induced currents and magnetic fields.

What is the direction of the induced magnetic field in the coil when the bar magnet is

moving from left to right?

A. the induced field is zero tesla

B.

right to left

C.

left to right

Part 2) What is the direction of the induced current in resistor R when the bar magnet is moving

from left to right?

A. from“a” through R to “b”

B.the induced current is zero amperes

C.

from “b” through R to“a”

Answer 1

Part 1 ) right to left Lenz's law explains that the induced magnetic field is in the direction that opposes the change in the magnetic flux through the loop

Part 2 ) from "a" through R to " b "

induced current is in the direction that opposes the change in the magnetic flux through the loop

Answer 2

E xplanation:When the magnet move from left to rightthe magnetic flux flux linked with magnet is iong tobe changesthis change of magntic flux willcause an induced e.m.f in the coilacc.to electromagnetic induction law ,e.m.f= e = - dφ_B / dtwheredφ_B / dt is the change of magnetic flux , it will results e.m.fin the coil .but, by the lenz's law ,the induced e.m.f is always opposes the change that causesthus,induced em.f or current isset in the anti- clock wise directionnow, this induced current will results an induced magnetic fieldsuchthat , the end of the coil near the north pole is acts as south polewjhere as the othre end of the coil acts as north pole