# Lenz’S law solved problem

1) A constant uniform magnetic field of 0.50 T is applied at right angles to the plane of a flat rectangular loop of initial area 3.0×10 m2. If the area of this loop changes steadily from its original value to a final value of 1.6×10 m2 in 3.2s, what is the emf induced in the loop? A) 0 V B) 3.8 x 102v C) 2.2× 10-2 v D) 0.8 x 10 v E) 4.5 x 10- v 2) A rectangular coil is moving away from a current carrying wire as shown in the figure. When viewed from above, what is the direction of the induced current in this coil? A) counterclockwise B) clockwise C) clockwise initially, then counterclockwise D) There is no induced current in this coil. 3) A metal ring is dropped into a localized region of constant magnetic field, as indicated in the figure at the right. The magnetic field is zero above and below the indicated region A) Loop 2 has counterclockwise current, loop 1 has no induced current, and loop 3 has no induced current. B) Loop 3 has clockwise current, loop 1 has no induced current, and loop 2 has counterclockwise C) Loop 1 has clockwise current, loop 2 has no induced current, and loop 3 has counterclockwise current. D) Loop 2 has clockwise current, loop 1 has no induced current, and loop 3 has no induced current. E) Loop 1 has counterclockwise current, loop 2 has no induced current, and loop 3 has clockwise current.

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