A galvanometer having a coil resistance of `60 Omega` shows full scale defection when a current of `1.0 A` passes thoguth it. It can vbe convered into an ammeter to read currents up to `5.0 A` by

Options

A. putting a parallel resistance of 240 ohm
B. putting a series a resistance of 150 ohm
C. putting a series a resistance of 240ohm
D. putting a parallel resistance of 15 ohm

Answer

A

Explanation

`Y_(cm) = (m_(1)y_(1) + m_(2)y_(2) + m_(3)y_(3))/(M_(1) + M_(2) + M_(3))`
`Y_(cm) = (6m(o) + m( + a) + m(a) + m(-a) + m(0))/(10m), Y_(cm) = (a)/(10)`