Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 5

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For a metallic conductor, if $ρ_{T}$ is resistivity at $T ° C$ and $ρ_{0}$ is resistivity at reference temperature $T_{0} ° C,$ then resistivity $ρ_{T}$ is given by $(α$ is temperature coefficient of resistivity)

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Important Questions on Current Electricity

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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 6

If the length of wire is stretched by

0.2 %,

then percentage increment in its resistance is

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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 7

Two resistances

2 Ω

and

4 Ω

are connected in series in an electric circuit. Ratio of thermal power dissipated in each resistance is

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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 8

If

R_{1}

and

R_{2}

are the resistances of two resistors having power

50 W

and

100 W

respectively designed to operate at same voltage, then

\frac{R_{1}}{R_{2}}

is

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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 9

Which one of the following has negative temperature coefficient of resistance?

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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 11

Establish the relation between current

(I)

and drift velocity

(V_{d})

of electrons in a conductor is (where

n

is the number density of electrons and

A

is cross-sectional area)

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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 13

In the absence of electric field, possible path of free electrons inside a conductor between consecutive collision is

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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 16

If there is no deflection in the galvanometer in the given network, then the value of resistance $R$ is

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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 1

Current $l$ versus time $t$ graph through a conductor is shown in the figure. Average current through the conductor in the interval $0$ to $15 s$ is

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