Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 32

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$Si$ and $Cu$ are cooled to a temperature of $300 K$ then resistivity?

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Important Questions on Current Electricity

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 33

Two copper wires are of the same length one of them twice as thick as the other. Then the resistance of the two wires is in the ratio of:

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 34

If resistance of the wire at

50 ° C

is

5 R Ω

and at

100 ° C

it is

6 R Ω,

then find the resistance of wire at

0 ° C :

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 35

For a metallic wire, the ratio

\frac{V}{i}

(

V =

applied potential difference and

i =

current flowing) is

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 36

The length of a given cylindrical wire is increased by

100 %

. Due to the consequent decrease in diameter, the change in the resistance of the wire will be :

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 37

If on applying the potential of

20 V

on a conductor its conductance becomes

8 Ω^{- 1}

, then the current flowing through it will be

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 38

The figure shows a graph of current $(I)$ flowing through a cell against its terminal voltage $(V) .$ The emf and internal resistance of this cell are

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 39

A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 40

A material

B

has twice the specific resistance of

A .

A circular wire made of

B

has twice the diameter of a wire made of

A .

Then for the two wires to have the same resistance, the ratio

\frac{l_{A}}{l_{B}}

of their