Q. In the circuit shown in figure-, reading of ammeter will

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A

Increase if is closed

B

Decrease if is closed

C

Increases if is closed

D

Decrease if is closed

Solution:

By closing switch , net external resistance will decrease this increases the circuit current so ammeter reading will increase.
By closing , equivalent EMF will remain unchanged but equivalent internal resistance of battery will decrease and this increases the circuit current so ammeter reading will increase.

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