Current Electricity and Electrical InstrumentHard

Question

When a galvanometer is shunted with a 4Ω resistance, the deflection is reduced to one - fifth. If the galvanometer is further shunted with a 2Ω wire, determine current in galvanometer now if initially current in galvanometer is I0  (given main current remain same) .

Options

A.I0/13
B.I0/5
C.I0/8
D.5I0/13

Solution

(I0 − ) 4 = G          ...(1)
(I0 − Ig) = I0G         ...(2)
from (1) and (2)

12Ig = I0 − Ig    ⇒    Ig =       Ans

Create a free account to view solution

View Solution Free
Topic: Current Electricity and Electrical Instrument·Practice all Current Electricity and Electrical Instrument questions

More Current Electricity and Electrical Instrument Questions

In the circuit shown, the current in the 1Ω resistor is :-...A battery of internal resistance 4Ω is connected to the network of resistance as shown in figure. In order that the...Eels are able to generate current with biological cells called electroplaques . Theelectroplaques The electroplaques is ...Two sources of equal emf are connected to an external resistance R. The internal resistance of the two sources are R1 an...Two heater wires of equal resistance are first connected in series and then in parallel. The ratio of heat produced in t...