Student Login

Home›Chapters›Moving Charges and Magnetism PYQs›Moving Coil Galvanometer, Ammeter & Voltmeter›Question 28

NEET 2008 (AIPMT) · Moving Coil Galvanometer, Ammeter & Voltmeter

Moving Coil Galvanometer, Ammeter & Voltmeter question from NEET 2008 (AIPMT)

Q28NEET 2008 · AIPMTMedium

Moving Coil Galvanometer, Ammeter & Voltmeter

A galvanometer of resistance 50 $\Omega$ is connected to a battery of 3 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

Show answer and solution

Answer: (b)

Full scale (30 div): $I = \frac{3}{50 + 2950} = 1$ mA.
For 20 divisions: $I' = \frac{2}{3}$ mA.
Total resistance $= \frac{3}{(2/3) \times 10^{-3}} = 4500\ \Omega$ , so series $R = 4500 - 50 = 4450\ \Omega$ .
So the answer is (b) $4450\ \Omega$ .

Report a mistake

More questions on Moving Coil Galvanometer, Ammeter & Voltmeter

The resistance of an ammeter is 13 Ω and its scale is graduated for a current upto 100…NEET 2007 (AIPMT)
To convert a galvanometer into a voltmeter one should connect aNEET 2004 (AIPMT)
A galvanometer of 50 ohm resistance has 25 divisions. A current of 4 × 10 - 4 ampere…NEET 2004 (AIPMT)
To convert a galvanometer into a voltmeter one should connect aNEET 2002 (AIPMT)
To convert a galvanometer into a ammeter, one needs to connect aNEET 1992 (AIPMT)
If the number of turns in the coil of a moving coil galvanometer decreases, the…MHT CET 2026 (13 Apr, Shift 1)
An ammeter has resistance R and range I. What resistance should be connected in parallel…MHT CET 2026 (13 May, Shift 2)
The value of shunt resistance that allows 5% of the main current through the galvanometer…MHT CET 2026 (12 May, Shift 1)