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At the sharp projection of a charged body the charge density becomes very high. Due to which the air molecules which come in contact with such projection become ionised or broken down into free electrons and positive air Ions. Then similar charges are repelled away by the tips whereas the opposite charges go towards the tip and get attracted by the tip. These opposite charges reduce the no. of charges present on the tip. he process continuously takes place and charge present on the tip continuously goes on decreasing.

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Q: Why are sharp projections avoided in machines?
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