First slide

Moving coil Galvanometer

Question

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)

Moderate

A

one – sixth
B

one – fifth
C

one - seventh
D

two – third

Solution

$s h u n t s = \frac{G}{n - 1} G i s t h e g a l v a n o m e t e r r e s i s \tan c e a n d n i s n o o f t m e s r a n g e i s a m p l i f i e d f i r s t t m e 6 = \frac{G}{3 - 1} G = 12 w h e n f u r t h e r s h u n t e d b y 3 o h m s e q u i v a l e n t s h u n t b e c o m e s \frac{6 x 3}{6 + 3} = 2 a g a i n 2 = \frac{12}{n - 1} n = 7$

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