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Two voltmeters and two resistances are c...

Two voltmeters and two resistances are connected as shows in Fig. 6.65. On closing the swich `S`, what will be the effect on the readings of the voltmeters?

A

`V_(1)` increases

B

`V_(1)` decreases

C

`V_(2)` increases

D

`V_(2)` decreases

Text Solution

Verified by Experts

The correct Answer is:
B, C
When switch `S` is open, `R_(1)` and `R_(2)` are short-circuited. `E` wil be
divided between `V_(1)` and `V_(2)` only. After closing the switch, `V_(1)`,
`R_(1)`, and `R_(2)` will be in parallel. Their effective resistance wil be less than the resistance of `V_(1)`. Hence, potential difference across `V_(2)` decreases and so across `V` increases.
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