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A coil having an inductance of 100 mH is carrying a current of 100 A. If the current is reduced to zero in 0.02 sec, the self induced e.m.f will be
A colour-blind person cannot
A concave lens always forms an image which is
A concave mirror produces a real, inverted image of the same size of the object. Then, the object is at a distance
A convex mirror of focal length f (in air) is immersed in a liquid (u=4/3). The focal length of the mirror in the liquid will be :
A copper disc has a hole. If the disc is heated, the size of the hole
A copper wire of radius r and length l has a resistance of R. A second copper wire with radius 2r and length l is taken and the two wires are joined in a parallel combination. The resultant resistance of the parallel combination of the two wires will be
A cube of wood supporting a block of mass 200 grains just floats in water. When the block is removed, the cube rises by 2 cm. What is the size of the cube?
A cup of hot coffee is placed on a metal table in a room. By which of the following methods does it lose heat?
A current carrying conductor is associated with
