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A circular coil carrying a current I has radius R and number of turns N . If all the three, i.e., the current I, radius R and number of turns N are doubled, then magnetic field at its centre becomes

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A circular coil carrying a current I has radius R and number of turns N . If all the three, i.e., the current I, radius R and number of turns N are doubled, then magnetic field at its centre becomes

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The gravitational force causes (A) Tides (B) None of them (C) Motion of moon (D) Both (a) and (c)

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If energy(E), velocity (V) and force (F) be taken as fundamental quantity, then what are the dimension of mass ?

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The mass of the earth is 81 times the mass of the Moon and the distance between the earth and the Moon is 60 times the radius of earth. If R is the radius of the earth, then the distance between the Moon and the point on the line joining the Moon and the earth where the gravitational force becomes zero is

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A current flows in a conductor from east to west. The direction of the magnetic field at a point above the conductor is: A. towards east B. towards west C. towards north D. towards south

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A circular coil carrying a current I has radius R and number of turns N . If all the three, i.e., the current I, radius R and number of turns N are doubled, then magnetic field at its centre becomes

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The gravitational force causes (A) Tides (B) None of them (C) Motion of moon (D) Both (a) and (c)

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