A battery of e.m.f. 12V and internal resistance `2Omega` is connected in series with a tangent galvanometer of resistance `4Omega`. The deflection is `60^@` when the plane of the coil is along the magnetic meridian. To get a deflection of `30^@`, the resistance to be connected in series with the tangent, galvanometer is :

Options

A. `16 Omega`
B. `20 Omega`
C. `10 Omega`
D. `5 Omega`