Question 360: Current Electricity

Question

A galvanometer, whose resistance is 50 ohm, has 25 divisions in it. When a current of 4 $$ 	imes $$ 10
–4
A passes through it, its needle ( pointer) deflects by one division. To use this galvanometer as a voltmeter of range 2.5 V, it should be connected to a resistance of :

Accepted Answer

I
g
= 4 $$ 	imes $$ 10
$$-$$4
$$ 	imes $$ 25 = 10
$$-$$2
A
2.5 = (50 + R) 10
$$-$$2
$$ 	herefore $$   R = 200 $$\Omega $$

Answer

200 ohm

Answer

250 ohm

Answer

6200 ohm

Answer

6250 ohm

Current Electricity

A galvanometer, whose resistance is 50 ohm, has 25 divisions in it. When a current of 4 $ \times $ 10 –4 A passes through it, its needle ( pointer) deflects by one division. To use this galvanometer as a voltmeter of range 2.5 V, it should be connected to a resistance of :

Choose the correct answer: