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

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A conductor carries a current of $1 A .$ In $1 s$ the charge that flows through any cross-section of conductor is

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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 2

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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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 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 10

The relaxation time

(τ)

, number density of free electrons

(n)

and resistivity

(ρ)

of a conductor are related as

(m

is mass of electron and

e

is electronic charge)

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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 16

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

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