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202.

Effective resistance between A and B in the following circuit

10 Ω

20 Ω

5 Ω

$\frac{20}{3}\mathrm{\Omega}$

203.

Two heating coils of resistances 10 Ω and 20 Ω are connected in parallel and connected to a battery of emf 12 V and internal resistance 1 Ω. The power consumed by them are in the ratio

1 : 4

1 : 3

2 : 1

4 : 1

204.

Of the following graphs, the one that correctly represents the I-V characteristics of a 'Ohmic device' is

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205.

The working of magnetic braking of trains is based on

eddy current

pulsating current

alternating current

steady current

206.

A cylindrical conductor of diameter 0.1 mm carries a current of 90 mA. The current density (in Am^{-2}) is (π ≈ 3)

12 × 10

^{7}3 × 10

^{6}6 × 10

^{6}2.4 × 10

^{7}

207.

A straight wire of length 50 cm carrying a current of 2.5 A is suspended in mid-air by a uniform magnetic field of 0.5 T (as shown in figure). The mass of the wire is (g = 10 ms^{-2})

250 gm

125 gm

62.5 gm

100 gm

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In meter bridge experiment, with a standard resistance in the right gap and a resistance coil dipped in water (in a beaker) in the left gap, the balancing length obtained is 'l'. If the temperature of water is increased, the new balancing

< 1

> 1

= 0

= 1

B.

> 1

According to the question,

$\frac{{\mathrm{R}}_{\mathrm{unknown}}}{{\mathrm{R}}_{\mathrm{standard}}}=\frac{\mathrm{l}}{\left(1-\mathrm{l}\right)}$

If temperature increases than resistance mcreases. Hence the new balancing is greater than 1.

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