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Question

An ammeter has a range I with resistance Ro, which of the following resistance can be connected in series with it to decrease it range, toIn:

A
Ron
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B
Ro(n1)
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C
Ro(n+1)
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D
none of these
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Solution

The correct option is B Ro(n1)
Suppose series resistance R is connected in series to it
Thus current become I/n
Before and after connecting R, the voltage V
Would remain same
From ohm's law
V=IR0=In(R0+R)
Rearrange to get
R=R0(n1)

1080617_1172516_ans_794920ef5b1e419393aa21a6d52f4c81.png

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