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Moving Charges And Magnetism

Question

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The resistance of a galvanometer is 50 $Ω$ and the current required to give full scale deflection is 100 A. In order to convert it into an ammeter for reading up to 10 A, it is necessary to put a resistance of
5 x 10^–32Ω
5 x 10^–4 Ω
5 x 10^–5 Ω
5 x 10^–2 Ω

Solution

B.

5 x 10^–4 Ω

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 M_1.

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