Physics
A galvanometer can be converted to a voltmeter by connecting

A low resistance in parallel
A high resistance in series
A high resistance in parallel
A low resistance in series

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Physics
Lightning is produced when

Similar charges of electricity rush towards each other and then get repelled
Strong opposite charges in different clouds break down the resistance offered by the intervening air
Water vapour produces electricity in the clouds
Clouds strike against impurities in air and the friction burns up these impurities

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