An ammeter gives full deflection when a current of `2 amp`. Flows through it. The resistance of ammeter is `12 ohms`. If the same ammeter is to be used for measuring a maximum current of `5 amp`, then the ammeter must be connected with a resistance of

Options

A. `8 ohms` in series
B. `18 ohms` in series
C. `8 ohms` in parallel
D. `18 ohms` inparallel

Answer

C

Explanation

(c ) `(i)/(i_(g)) = 1 + (G)/(S) implies (5)/(2) = 1 + (12)/(S) implies S = 8 Omega` (In parallel)