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To locate null point, deflection battery...

To locate null point, deflection battery key `K_(1)` is pressed before the galvanometer key `K_(2)`. Explain why?

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If galvanometer key `K_(2)` is pressed firdt then just after closing the battery key `K_(1)` current suddenly increase.
So, due to self induction ,a large back emf is generated in the galvanometer, which mwy damage the galvanometer.
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