To measure the field `'B'` between the poles of an electronmagnet, a small test loop of area `1 cm^(2)`, resistance `10 Omega` and `20` turns is pulled out of it. A galvanometer shows that a total charge `2mu C` passed through the loop. The value of `'B'` is

It is desired to measure the magnitude of field between the poles of a powerful loud speaker magnet. A small flat search coil of area 2cm^(2) with 25 closely wound turns, is positioned normal to the field direction and then quickly snatched out of the field region. Equivalently, one can give it a quick 90^(@) turn to bring its plane parallel to the field directio). The total charge flown in the coil (measured by a ballistic galvanometer connected to coil) is 7.5 mC. The combined resistance of the coil and the galvanometer is 0.50Omega Estimate the field strength of magnet.

It is desired to measure the magnitude of field between the poles of a powerful loud speaker magnet. A small flat search coil of area 2 cm^2 with 25 closely wound turns, is positioned normal to the field direction, and then quickly snatched out of the field region. Equivalently, one can give it a quick 90^@ turn to bring its plane parallel to the field direction). The total charge flown in the coil (measured by a ballistic galvanometer connected to coil) is 7.5 mC. The combined resistance of the coil and the galvanometer is 0.50 Omega . Estimate the field strength of magnet.

It is desired to measure the magnitude of field between the poles of a powerful loud speaker magnet. A small flat search coil of area 2 "cm"^2 with 25 closely wound turns, is positioned normal to the field direction, and then quickly snatched out of the field region. Equivalently, one can give it a quick 90^@ turn to bring its plane parallel to the field direction). The total charge flown in the coil (measured by a ballistic galvanometer connected to coil) is 7.5 mC. The combined resistance of the coil and the galvanometer is 0.50 Omega . Estimate the field strength of magnet.

It is desired to measure the magnitude of field between the poles of field between the poles of a powerful loud speaker magnet. A small flat search coil of area 2cm^(2) with 25 closely wound turns, is positioned normal to the field direction and then quickly snatched out of the field region. Equivalently, one can give it a quick 90^(@) turns to bring its plane parallel to the field direction. The total charge flown in the coil (measured by a ballistic galvanometer connected to the coil) is 7.5mC. The combined resistance of the coil and the galvanometer is 0.50Omega . Estimate the field strength of magnet.

It is desired to measure the magnitude of field between the poles of a powerful loud speaker magnet.A small flat search coil of area 2cm^2 with 25 closely wound turns, is positioned normal to the field direction, and then quickly snatched out of field region. Equivalently , one can give it quick turn to bring its plane parallel to the field direction. The total charge flown in the coil (measured by a ballistic galvanometer connected to coil) is 7.5 mC.The combined resistance of coil and the galvanometer is 0.5 Omega .Estimate the field strength of magnet.

A rectangular loop of sides 10cm and 5cm with a cut is stationary between the pole pieces of an electromagnet. The amgnetic field of the magnet is normal to the loop. The current feeding the electromagnet is reduced so that the field decreases from its initial value of 3.0 T at the rate of 0.02 T s^(-1) . If the cut is joined and the loop has a resistance of 2.0 Omega , the power dissipated by the loop as heat is