Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 2

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The correct relation between current density $(\vec{J})$ and electric field $(\vec{E})$ is

(Where $ρ$ is resistivity, $σ$ is conductivity and $R$ is resistance of conductor)

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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 3

Graph between voltage and current for conductor is shown in figure. If $T_{1}$ and $T_{2}$ are temperatures, then which one of the following option is correct?

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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 4

Charge through a cross-section of a conductor is given by

Q = (t^{5} + 2 t)

coulomb. The instantaneous current through the conductor at

t = 1 s

is,

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

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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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)