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A electrical circuit is shown in the fig...

A electrical circuit is shown in the figure. The value of current I passing through the battery is (all quantities are in SI units)

A

`(V)/(30)`

B

`(v)/(10)`

C

`(30V)/(7)`

D

`(7V)/(30)`

Text Solution

Verified by Experts

The correct Answer is:
D
Use wheatstone bridge concept
`R_1/R_2 = R_3/R_4`
`4/10=2/5`
Hence bridge is balanced
Then `R_(eq) = (6xx15)/(21) = 30/7`
`V=iR_(eq)`
`i=(V)/(30/7) = (7V)/(30)`
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