Question

For a post office box, the graph of galvanometer deflection versus (R ) (resistance pulled out of resistance box) for the ratio `100:1 ` is given as shown. Find the value of unknown resistance.
.
A. 3.2 ohm
B. 3.24 ohm
C. 3.206 ohm
D. None

Answer 1

Correct Answer - B
Deflection is zero for 324 so value of unknown resistance `= (324)/(100) = 3.24 Omega`