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An observer with normal eyes views an object with a magnifying glass of focal length 5 cm. The angular magnification is [least distance of distinct vision D = 25 cm]
A short chain is sometimes attached to the back of a petrol tanker to
An electric generator has an e.m.f. of 240V and an internal resistance of 1 ?. If the current supplied by the generator is 20 A when the terminal voltage is 220 V, find the ratio of the power supplied to the power dissipated.
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