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Assertion In a simple battery circuit, the point of the lowest potential is positive terminal of the battery. Reason The current flows towards the point of the higher potential, as it does in such a circuit from the negative to the positive terminal. In a simple battery circuit, the point of the lowest potential is positive terminal of the battery.

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Which of the following has more inertia? A five-rupee coin or a one-rupee coin.

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Two forces, while acting on a particle in opposite; directions, have the resultant of 10N. If they act at right angles to each other, the resultant is found to be 50N. Find the two forces.

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The frequency n of vibration of stretched string depends upon its length l, its mass per unit length m and Tension t in the string Obtain dimensionally an expression for frequency n.

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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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