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An object O is placed 30 cm in front of a concave mirror of focal length 10 cm. How far from the mirror is the image formed?
(2005)
A capacitor of capacitance 100 µF is charged to a potential difference of 20 V. What is the energy stored in the capacitor?
Draw a sketch of the magnetic field due to a long straight current-carrying conductor.
A pear-shaped conductor is placed on an insulated stand is shown. Copy the diagram and show how the charge is distributed over the conductor when it is positively charged.
Explain why high voltages are used in the transmission of electrical energy.
