HARD
12th Odisha Board
IMPORTANT
Earn 100

A wire of length l and radius r is connected to a voltage.  How the drift velocity of charges affected if, r is doubled

Important Questions on Electric Current

HARD
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 5 - Electric Current>MODEL QUESTIONS>Q 5
Two copper wires having the same length, but different cross-sections are connected to the same battery. How do the current densities in them compare?
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
MEDIUM
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 5 - Electric Current>MODEL QUESTIONS>Q 7
Explain the meaning of resistance of a conductor.
MEDIUM
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 5 - Electric Current>MODEL QUESTIONS>Q 8
What happens when two initially charged conducting bodies are connected by a wire?
HARD
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 5 - Electric Current>MODEL QUESTIONS>Q 9

Plot a curve to show the variation of ammeter reading, in the figure given below, as a function of rheostat reading. Interpret the shape and intercept of this curve 

Question Image

HARD
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 5 - Electric Current>MODEL QUESTIONS>Q 10
From the definition of quantity of electricity in terms of current. Show that I.l=vq, where v is the speed of the charges flowing through the conductor of length l.
HARD
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 5 - Electric Current>MODEL QUESTIONS>Q 11
Find the resistivity of wire of length 25.5 cm and diameter 0.932 mm, if its resistance is 0.067 ohm at a temperature of 20°C
HARD
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 5 - Electric Current>MODEL QUESTIONS>Q 12
Explain the origin of electrical resistance in a conductor.