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301.
A galvanometer of resistance 25 Ω shows a deflection of 5 divisions when a current of 2 mA is passed through it. If a shunt of 4 Ω is connected and there are 20 divisions on the scale, then the range of the galvanometer is

1 A

58 A

58 mA

30 mA

58 mA

Given: - Galvanometer resistance R_g = 25 Ω

There are 20 divisions on scale.

Initially, current for 20 divisions

i = $\frac{2 \times 20}{5}$

i = 8 mA

∴ i_g = 8 mA

Let I be the maximum current that galvanometer can read.

$∵ \frac{I_{g}}{I} = \frac{R_{S}}{R_{S} + R_{g}}$

⇒ I= $(\frac{R_{S} + R_{g}}{R_{S}}) I_{g}$

⇒ = $(\frac{4 + 25}{4}) \times 8$

⇒ = 29 × 2

⇒ I = 58 mA

302.

The length of a given cylindrical wire is increased by 150%. Due to the consequent decrease in diameter the change in the resistance of the wire will be

200 %
525 %
300 %
400 %

303.

The measurement of voltmeter in the following circuit is

2.25 V
4.25 V
2.75 V
6.25 V

304.

A meter bridge is set-up as shown, to determine an unknown resistance X using a standard 10 ohm resistor. The galvanometer shows null point when tapping-key is at 52 cm mark. The end-corrections are 1 cm and 2 cm respectively for the ends A and B. The determined value of

10.2 ohm
10.6 ohm
10.8 ohm
11.1 ohm

305.

A and B are two points on a uniform ring of resistance R. The ∠ ACB = 0, where C is the centre of the ring. The equivalent resistance between A and B is

306.

In the circuit shown in figure, if A the diode forward voltage is 0.3 V, the voltage difference between A and B is

1.3 V
2.3 V
0
0.5 V

307.

Assertion: An electrical bulb starts glowing instantly as it is switched on.

Reason: Drift speed of electrons in a metallic wire is very large.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false

308.

A voltmeter of resistance 20000 Ω reads 5 volt. To make it read 20 volt, the extra resistance required is

40000 Ω in parallel
60000 Ω in parallel
60000 Ω in series
40000 Ω in series

309.

Ten identical cells each of potential E and internal resistance r are connected in series to form a closed circuit. An ideal voltmeter connected across three cells, will read