Given
magnitude of magnetic field  B = 7*10^ -5 T
area of the coil A = 11.8 cm^2
number of turns of the coil  N = 250
  magnetic flux through the coil
               Â
? = B A N cos?
  initially the plane of the coil is perpendicular to
the earth magnetic field
                 Â
?  = 0
total magnetic flux through the coil after it is rotated
                   ?
= BAN cos 0
                     Â
= 7*10^ -5 * 11.8 *10^ -4 * 250Â Â
                      Â
= 2.06*10^ -5 Wb
                      Â
average induced emf in the coil
               Â
?   = d ? /d t
                     Â
= 2.06*10^ -5 Wb / / 3*10^ -2
                     Â
= 0.687*10^ -3Â Â V
