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Moving Charges And Magnetism

Question
CBSEENPH12039704
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In a potentiometer experiment, the balancing with a cell is at length 240 cm. On shunting, the cell with a resistance of 2Ω the balancing length becomes 120 cm. The internal resistance of the cell is

  • 1 Ω

  • 0.5 Ω

  • 3 Ω

  • 2Ω

Solution

D.

2Ω

straight r space equals space straight R open square brackets calligraphic l subscript 1 over calligraphic l subscript 2 minus 1 close square brackets space space equals space 2 open square brackets 240 over 120 minus 1 close square brackets space equals space 2 straight capital omega

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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