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Moving Charges And Magnetism

Question
CBSEENPH12047823
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A galvanometer can be changed into an ammeter by using

  • low resistance shunt in series

  • low resistance shunt in parallel

  • high resistance shunt in series

  • high resistance shunt in parallel

Solution

B.

low resistance shunt in parallel

A galvanometer can be converted to ammeter by connecting a low resistance ( called shunt resistance) in parallel to the galvanometer. If resistance is connected in parallel, then some of the current will flow through resistance.

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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