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Moving Charges And Magnetism

Question
CBSEENPH12037655
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The scale of a galvanometer of resistance 100 ohm contains 25 divisions. It gives a deflection of one division on passing a current of 4 x 10–4 A. The resistance in ohms to be added to it, so that it may become a voltmeter of range 2.5 volt is

  • 100

  • 150

  • 250

  • 300

Solution

B.

150

Some More Questions From Moving Charges And Magnetism Chapter

Two moving coil meters, M1 and M2 have the following particulars:
R1 = 10 Ω   N1 = 30,
A1 = 3.6 x 10–3 m2,  B1 = 0.25 T
R2 = 14 Ω;  N2 = 42,
A2 = 1.8 x 10–3 m2, B2 = 0.50 T
(The spring constants k are identical for the two meters).
Determine the ratio of (a) current sensitivity and (b) voltage sensitivity of M2 and M1.

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