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Q.

The scale of a galvanometer is divided into 150 equal divisions. The galvanometer has the current sensitivity of 10 divisions per mA and the voltage sensitivity of 2 divisions per mV. How the galvanometer be designed to read i) 6A, per division and ii) 1V, per division ?

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a

40μΩ is connected in parallel, 1000Ω is connected in series

b

8.3×105Ω  is connected in parallel, 9995Ω is connected in series

c

8.3μΩ is connected in parallel, 9995Ω is connected in series

d

20μΩ is connected in parallel, 9995Ωis connected in series

answer is D.

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Detailed Solution

N=150; ig=0.1mA/division

Vg=0.5mV/ division ; G=Vgig=5Ω

(i) shunt required to read i = 6A/division is S=Gigiig=8.3×105Ω( in parallel )

(ii) Resistance required to read the voltage V=1V/ division is =GV/Vg1=9995Ω (in series)

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