B: 820 kg
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A uniform beam is balanced at its midpoint. An object is placed on the beam, as shown. Which force will rebalance the…
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…
The diagram shows a d.c. motor. Why is a split-ring commutator used?
A magnet is pushed slowly into a coil and there is a current in the coil in the direction shown. The magnet is then p…
A cathode-ray oscilloscope is connected to an a.c. generator. A wave is seen on the screen of the oscilloscope. The s…