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Current Electricity question bank (Physics)

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Q1.

A galvanometer of resistance $50 \Omega$ is connected to a battery of $3 \mathrm{~V}$ along with a resistance of $2950 \Omega$ in series. A full scale deflection of 30 divisions is obtained in the galvanometer. In order to reduce this deflection to 20 divisions, the resistance in series should be

(A)
$5050 \Omega$
(B)
$5550 \Omega$
(C)
$6050 \Omega$
(D)
$4450 \Omega$
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Q2.

The resistance of an ammeter is $13 \Omega$ and its scale is graduated for a current upto $100 \mathrm{~A}$. After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto $750 \mathrm{~A}$ by this meter. The value of shunt resistance is

(A)
$20 \Omega$
(B)
$2 \Omega$
(C)
$0.2 \Omega$
(D)
$2 \mathrm{k} \Omega$
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