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19 For a metallic conductor, Ohm's law holds provided potential difference varies current remains constant temperature remains constant potential difference remains constant 20 Calculate the distance and magnification of an object placed 20cm from a converging lens 60cm and 0.3 times the size of object 20cm and 0.3 times the size of object 60cm and 3 times the size of object 80cm and 3 times the size of object
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