When a galvanometer shunt of `4Omega` is attahced to a galvanometer, the deflection reduces to `(1)/(5)`th. If an additional shunt of `2Omega` is attached. What will be the deflection?

Answer

(B)

Explanation

`X_(cm) = (m((l)/(2)) + m ((l)/(2) + (l)/(2)) + m ((l)/(2) + (l)/(4) + (l)/(2)) + m ((l)/(2) + (l)/(4) + (l)/(6) + (l)/(2)))/(m + m + m + m) = (25)/(24)l`