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Find the ratio ofcurrents as measured by...

Find the ratio ofcurrents as measured by ammeter in two cases when the key is open and when the key is closed :

A

`9//11`

B

`10//11`

C

`8//9`

D

`8//11`

Text Solution

Verified by Experts

The correct Answer is:
C
When K is open `R_("net")=3R//2:." "i_(1)=E//(3R//2)=(2E)/(3R)`
When K is closed
`R_("net")=2[(Rxx2R)/(R+2R)]=(4)/(3)R" ":.i_(2)=E=//(4R//2)=(3E)/(4R)" "(i_(1))/(i_(2))=(8)/(9)`
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