A milliammeter of range `10 mA` and resistance `9 Omega` is joined in a circuit as shown. The metre gives full-scale deflection for curretn `I` when `A` and `B` are used as its terminals, i.e., current enters at `A` and leaves at `B` (`C` is left isolated). The value if `I` is

Options

A. `100 mA`
B. `900mA`
C. `1A`
D. `1.1A`

Answer

C

Explanation

In parallel, current distributes in inverse ratio of resistance
`:. 0.01/(I-0.01)=0.1/(9+0.9)`
Solving we get, `I=1A`