In the presence of an applied electric field ( E ) → in a metallic conductor,

the electrons move randomly but slowly drift in a direction opposite to E → .

the electrons move in the direction of E → .

the electrons move in a direction opposite to E → .

the electrons may move in any direction randomly, but slowly drift in the direction of E → .

A piece of copper and another of germanium are cooled from room temperature to 80 K . The resistance of...

copper decreases and germanium increases

copper increases ∧ germanium decreases

Copper and Silicon are cooled from 300 K to 60 K . The specific resistance

decreases in copper but increases in silicon

increases in copper but decreases in silicon

Constantan wire is used in making standard resistances because its

temperature coefficient of resistance is negligible

E M B I B E

Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 1>Q 162

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Two resistances A and B have colour codes orange, blue, white and brown, red, green respectively. Then ratio of their resistances $R_{A} : R_{B}$ is

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Important Questions on Current Electricity

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 1>Q 163

The colour code for a carbon resistor of resistance

0.25 kΩ \pm 10 %

is

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 1>Q 164

The colour coding on a carbon resistor is shown in the given figure. The resistance value of the given resistor is:

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 1>Q 165

In the given circuit the internal resistance of the $18 V$ cell is negligible. If $R_{1} = 400 Ω, R_{3} = 100 Ω$ and $R_{4} = 500 Ω$ and the reading of an ideal voltmeter across $R_{4}$ is $5 V,$ then the value $R_{2}$ will be

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 1>Q 166

A current of

2 mA

was passed through an unknown resistor which dissipated a power of

4.4 W .

Dissipated power when an ideal power supply of

11 V

is connected across it is:

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 1>Q 167

Two equal resistances when connected in series to a battery, consume electric power of

60 W

. If these resistances are now connected in parallel combination to the same battery, the electric power consumed will be:

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 1>Q 168

In the presence of an applied electric field

\vec{(E)}

in a metallic conductor,

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 1>Q 169

Two resistors

R_{1} = (24 \pm 0.5) Ω

and

R_{2} = (8 \pm 0.3) Ω

are joined in series. The equivalent resistance is :

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 1>Q 170

In the shown arrangement of the experiment of the meter bridge if the length $A C$ corresponding to null deflection of galvanometer is $x,$ what would be its value if the radius of the wire $A B$ is doubled?

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