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

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