Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 52

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A $50 W$ bulb connected in series with a heater coil is put to an $AC$ mains. Now the bulb is replaced by a $100 W$ bulb. The heater output will

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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 53

Two heater coils separately take

10

minute and

5

minute to boil certain amount of water. If both the coils are connected in series, the time taken will be

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

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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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?

Question Image

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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