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In the given ciruit Ammeter reading is s...


In the given ciruit Ammeter reading is same when both switches `S_(1),S_(2)` are closed or opened. The value of resistance R is

A

`200Omega`

B

`100Omega`

C

`400Omega`

D

`-300Omega`

Text Solution

Verified by Experts

The correct Answer is:
D
When `S_(1)` and `S_(2)` are opened, `i=(1.5)/(450)` .(i)
When `S_(1)` and `S_(2)` are closed
`i=(.15[100+R])/(400R+30,000)` .(ii)
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