Q.

When a galvanometer is shunted with a  6 ohm resistance, the deflection is reduced to one third. If the galvanometer is further shunted with a resistance of  3 ohm, the deflection is reduced to  (relative to first reading)

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a

one – sixth

b

one – fifth

c

one - seventh

d

two – third

answer is C.

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Detailed Solution

shunt  s=Gn-1 G is the galvanometer resistance and n is no of tmes range is amplified first tme 6= G3-1  G=12 when further shunted by 3 ohms  equivalent shunt becomes 6 x36+3=2 again 2=12n-1 n=7
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