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

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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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Important Questions on Current Electricity

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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

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 41

The resistance of a wire is

5 Ω

at

50 º C

and

6 Ω

at

100 ° C

. The resistance of the wire at

0 ° C

will be

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 42

Consider a thin square sheet of side $L$ and thickness $t,$ made of a material of resistivity $ρ .$ The resistance between two opposite faces shown by the shaded areas in the figure is:

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 43

The specific resistance of a conductor increases with

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 44

Fuse wire is a wire of:

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 45

The electric resistance of a certain wire of iron is

R

. If its length and radius are both doubled, then

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 47

When a wire of uniform cross-section

a

, length

l

and resistance

R

is bent into a complete circle, the resistance between two diametrically opposite points will be:

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 48

A wire of a certain material is stretched slowly by ten per cent. Its new resistance and specific resistance become respectively: