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In the circuit shown, the reading of the...

In the circuit shown, the reading of the Ammter is doulbed after the switch is closed. Each resistor has a resistance `= 1 Omega` and the ideal cell has an e.m.f. `= 10 V`. Then the ammeter has a resistance equal to

A

`2Omega`

B

`1Omega`

C

`2.5Omega`

D

none

Text Solution

Verified by Experts

The correct Answer is:
A
a. Ohm's las `V = IR or V prop I` (for ammeter)
`V_2/V_1 = I_2/I_1 = 2`
or `10 = 2 xx 10 xx R/(2+R) or R = 2Omega` .
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