Aflat coil is wrapped with 200 turns of very thin wire on a square frame with sides 18 cm long. a uniform magnetic field is applied perpendicular to the plane of the coil. if the field changes uniformly from 0.50 t to 0.00 t in 8.0 s, find the emf induced in the coil.

0.405 V

Explanation:

Using Faraday-Lenz law, the emf induced in the coil is given by

where

is the change in flux linkage through the coil

is the time interval

The change in flux linkage can be written as

where

N = 200 is the number of turns

is the area of the squared loop

Bi = 0.50 T is the initial magnetic flux density

Bf = 0.00 T is the final magnetic flux density

Substituting everything into the first equation, we find

it is easily magnetized.

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible