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The magnetic field in a travelling electromagnetic wave has a peak value of 20 nT. What is the peak value of electric field strength?

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What will happen to a compass needle when the compass is placed below a wire and a current is made to flow through the wire? Give a reason to justify your answer.

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Consider the charges q, q and –q placed at the vertices of the equilateral triangle, as shown in the figure. What is the force on each charge?

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An object is thrown vertically upwards to a height of 10 m. Calculate its (a) Velocity with which it was thrown upward. (b) Time taken by the object to reach the highest point.

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A body weighs 72 N on the surface of the earth. What is the gravitational force on it due to the Earth at a height equal to half the radius of the earth? (1) 48 n (2) 32 n (3) 30 n (4) 24 n

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Two copper wires, one of length 1 m and the other of length 9 m, are found to have the same resistance. Their diameters are in the ratio :

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A compass needle just above a wire in which electrons are moving towards east, will point: A) east B) west C) north D) south

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Explain parallax method for measuring distance of a nearly star.

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A parallel plate capacitor is charged and then isolated. The effect of increasing the plate separation on charge, potential and capacitance respectively are:

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If momentum of an object is increased by 10% then its kinetic energy will increase by?

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