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Last Updated On 01-06-2023 - By Jeesha Sara

A galvanometer having a resistance of 20  and 30 divisions on both sides has figure of merit 0.005 ampere/division. The resistance that should be connected in series such that it can be used as a voltmeter upto 15 volt, is :

a.

80

b.

120

c.

125

d.

100


Question ID - 50382 :-

A galvanometer having a resistance of 20  and 30 divisions on both sides has figure of merit 0.005 ampere/division. The resistance that should be connected in series such that it can be used as a voltmeter upto 15 volt, is :

a.

80

b.

120

c.

125

d.

100

1 Answer
5876 Votes
3537

Answer Key : (a) -

Rg = 200

NL = NR = N = 30

FOM =  = 0.005 A/Div.

Current sentivity = CS = =

Igmax = 0.005 × 30

          = 15 × 10−2  = 0.15

    15 = 0.15 [20 + R]

  100 = 20 + R

      R = 80



Next Question :

The circuit shown below contains two ideal diodes, each with a forward resistance of 50. If the battery voltage is 6 V, the current through the 100  resistance (in Amperes) is :-

a.

0.027

b.

0.020

c.

0.030

d.

0.036


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