A square loop of wire (10.0 cm side) moves from an area of no magnetic field (B

Question

A square loop of wire (10.0 cm side) moves from an area of no magnetic field (B - field = 0T) to a uniform B-field of 8.00 times 10^-5 T downward (into page) in 0.25 s. a. What is the change in flux that the loop experiences? b. What emf is created in the wire due to this change in flux? c. If the resistance of the wire is 1.35 ohm, what current is created? d. The direction of this current is a) clockwise (CW) b) counter-clockwise (CCW) c) neither e. If this emf creates a current that creates a magnetic field, which direction will the field point? a) down b) east c) north d) south e) up f)west

Explanation / Answer

the induced current and emf should oppose the increase in magnetic field

so the induced magnetic field should be opposite to the original magnetic field

hence

d)

Answer is b) counter-clockwise (CCW)

e)

the magnetic field should oppose the increase so should be opposite to original so

Answer is e) Up

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