C: weight of 15 N
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A student finds the centre of mass of a triangular lamina PQR. He drills a small hole at Q. He suspends the lamina fr…
The same downward force is applied to four objects resting on a horizontal surface. Which exerts the greatest pressur…
Four identical measuring cylinders contain liquid. Two contain water of density 1000 kg/m³. Two contain paraffin of d…
The diagram shows three pairs of parallel wires with the currents in the directions shown. For each pair of wires, wh…
The coil in an electric motor is wound onto a cylinder. Why is the cylinder made of soft iron?
The electromotive force (e.m.f.) induced in a conductor moving at right-angles to a magnetic field does not depend upon