Two tangent galvanometer have redii `7.5 cm` and `10 cm`, number of turns are 15 and 10 and resistances are `8 Omega` and `12 Omega`. They are joined in parallel in circuit. If deflection in one is `60^(@)` the deflection in second galvanometer is :

Two tangent galvanometers A and B have coils of radii 8cm and 16cm respectively and resistance 8ohm each. They are connected in parallel to a cell of emf 4V and negligible internal resistance. The deflections produced are 30^@ and 60^@ respectivley. A has 2 turns. What is the number of turns in B?

The resistance of the four arms of a Wheatstone bridge are P= 10Omega , Q = 100Omega , R= 40Omega and S =10Omega . What resistance in series or parallel with the last one will be required to obtain no deflection in the galvanometer?

In a galvanometer, the deflection becomes one half when the galvanometer is shunted by a 20Omega resistance is

In the given potentiometer circuit length of the wire AB is 3 m and resistance is R = 4.5 Omega . The length AC for no deflection in galvanometer is

A galvanometer of resistance 100 Omega gives the full scale deflection for a current of 10 m A. If a resistance of 1 Omega is connected in parallel to the coil of the galvanometer , then maximum current that can be measured with the galvanometer will be

A cell having an emf of 2 V and internal resistance of 0.5 Omega is sending current through a tangent galvanometer of resistance 4.5 Omega . If another external resistance of 95 Omega is introducedm the deflection of the galvanometer is 45^(@) , calculate the reduction factor fof the galvanometer?

A battery of emf 12 V 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

When a 12 Omega resistor is connected with a moving coil galvanometer, then its deflection reduces form 50 divions to 10 divisions. The ressitance of the galvanometer is