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Question (11)
QN0039077

A galvanometer of resistance 5 ohms gives a full scale deflection for a potential difference of . To convert the galvanometer into a voltmeter giving a full scale deflection for a potential difference of , the size of the resistance that must be attached to the voltmeter is              

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: C
Explanation:

;

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Question (12)
QN0039078

If  represents the actual number of deflections in a converted galvanometer of resistance  and shunt resistance . Then the total current  when its figure of merit is  will be :

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: D
Explanation:

By current division rule

Now, figure of merit

as,  actual number of deflection

So,  represent current

[(ii) corresponding to one scale division]

So,

[From (i) & (ii)]

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