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Physics

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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A cyclist moving on a circular track of radius 100 m completes one revolution in 4 minutes. What is his i) average speed ii) average velocity in one full revolution?

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If LCM of and is and the HCF of and is , then the value of is?

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The given figure gives a match stick pattern of triangles. Find the general rule that gives the number of matchsticks in terms of the number of triangles.

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A cone, a hemisphere and a cylinder stand on equal bases of radius and have equal heights .Prove that their volumes are in the ratio .

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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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