In a PO box experiment it is found that for the `1000:10` ratio, the deflection is to the left by 2 divisions when R is `437Omega` and to the right by 1.3 cm division when R is `436Omega`. Compute the correct value of the unknown resistance.

In A PO box experiment it is found that for the 100:10 ratio deflection in the galvanometer is to the left by 0.7 division of the scale when resistance I the rheostat are is 978Omega and to the right by 1.2 division when is 979Omega . Calculate the unknown resistance.

In a PO box experiment a student obserfes that he does not get the null point for any of the ratios. But when the ratio is 1000:10 he finds that the deflectioin is to the right by 1 division for 596Omega in the rheostat arm and 0.2 direction to the left when it is 597Omega . Compute the correct value of the unkown resistance from the observations of the student.

In a metre bridge , the balancing length from the left end is found to be 40cm, when a known resistance of 3Omega is placed in the right gap, then the value of unknown resistance is

In an experiment with a post office box, the radio of arms are 1000 : 10 . If the value of the third resistance is 999 Omega , find the unknows resistance.

A galvanometer has a 50 division scale. Bat- tery has no internal resistance. It is found that there is deflection of 40 divisions when R = 2400 Omega . Deflection becomes 20 divisions when resistance taken from resistance box is 4900 Omega . Then we can conclude :

The deflection in a MCG is reduced from 40 divisions to 10 divisions, when a shunt of 10 Omega is joined across it. What is the resistance of the galvanometer coil ?