A magnetic field of `2xx 10^-2` T acts at right angles to a coil area `100 cm^2` with 50 turns. The average emf induced in the coil is 0.1 volt when it is removed from the field in 't' seconds. The value of 't' in seconds is

In a magneic field of 0.05 tesla the area of a coil changes from 101 cm^2 to 100 cm^2 . The resistance of the coil is 2 ohm. The quantity of charge that flows during this period in microcoulomb is

A coil area 1000 turns and each of area 0.01 m^2 is in a magnetic field of 10^2 T. The magnetic field is at 90^@ to the plane of the coil. The coil is removed from the field in 0.1 second. Find the emf induced across the ends of the coil.