Bureau's Higher Secondary Physics Class 12>Chapter 5 - Electric Current>MODEL QUESTIONS>Q 19

HARD

12th Odisha Board

IMPORTANT

Earn 100

The metallic conductor is at a temperature $θ_{1}$ . The temperature of the metallic conductor is increased to $θ_{2}$ . How will the product of its resistivity and conductivity change?

Important Questions on Electric Current

MEDIUM

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 5 - Electric Current>MODEL QUESTIONS>Q 20

Write an expression for the resistivity of a metallic conductor showing its variation over a limited range of the temperature.

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 5 - Electric Current>MODEL QUESTIONS>Q 1

Explain the meaning of the drift velocity of electrons. Find an expression for current in conductor in terms of it

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 5 - Electric Current>MODEL QUESTIONS>Q 2

State and explain Ohm's law. Deduce it mathematically. Distinguish between ohmic and non ohmic resistance .

MEDIUM

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 5 - Electric Current>MODEL QUESTIONS>Q 3

Deduce the relation

\vec{J} = σ \vec{E}

from first principles considering Ohm's law to be true.

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 5 - Electric Current>MODEL QUESTIONS>Q 4

Discuss the different factors on which the resistance of a conductor depends. How does a semiconductor differ from a conductor?

MEDIUM

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 5 - Electric Current>MODEL QUESTIONS>Q 5

Show that current density

\vec{J} = \frac{n e^{2} τ}{m} \vec{E}

?

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 5 - Electric Current>MODEL QUESTIONS>Q 6

Discuss the variation of resistivity with temperature. Mention two important applications of the phenomenon.

EASY

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 5 - Electric Current>MODEL QUESTIONS>Q 1

Find the number of electrons that pass through a lamp in one hour if a steady current of $0.5 A$ is maintained in it during the time.