duration of |e| is
duration of |e| is
A circular coil of radius 8.0 cm and 20 turns is rotated about its vertical diameter with an angular speed of 50 rad in a uniform horizontal magnetic field of magnitude T. If the coil resistance is , maximum emf induced in the coil,maximum value of current in the coil and average power loss due to Joule heating are
average power loss due to joule heating
A horizontal straight wire 10 m long extending from east to west is falling with a speed of 5.0 m , at right angles to the horizontal component of the earth’s magnetic field, Wb m-2. Instantaneous value of the emf induced in the wire,direction of the emf and end of the wire which is at the higher electrical potential are
according to lenz's law direction of emf is West to East
A jet plane is travelling towards west at a speed of 1800 km/h. If the Earth’s magnetic field at the location has a magnitude of and the dip angle is , voltage difference developed between the ends of the wing having a span of 25 m is approximately
V = Vertical component of magnetic field
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 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 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 . Field strength of magnet is