
71)Which of the following is constant throughout a uniform magnetic field?
72)The force on a current-carrying conductor placed in a magnetic field becomes zero, when it is:
73)Electric motor converts:
74)The lens used to correct myopia is:
75)Which law indicates this relation?
76)Lenz's law explains about:
77)The formula for power of a lens is:
78)Which of the following obeys Ohm's law?
79)How many times does a ray of light refract when it passes through a prism?
80)Which of the following is used in household circuits to prevent damages due to overloading?
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