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If of the main current is to be passed through the moving coil galvanometer of resistance, then the required shunt resistance will be:

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answer is C.

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Detailed Solution

Concept: In this question first we draw an ammeter by connecting a resistance

in a shunt across the
Galvanometer whose resistance is given as

. Then equating the potential as they are connected in parallel
that is

and using this we can write

. Then after solving this we get the shunt
Resistance as

Galvanometer resistance is expressed as

.
The current through the galvanometer is

of the main current.
As a result, the current via the galvanometer is determined by:
Question Image

I is the total current i.e.

whereas

is the current through galvanometer i.e.

Hence, option 3 is correct .

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