HARD
12th ICSE
IMPORTANT
Earn 100

Write vector form of Ohm' law universal? Show graphically ohmic and-ohmic nature of the conductors, giving examples of each.

Important Questions on Electric Resistance and Ohm's Law

HARD
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 5

Explain resistivity, show its variation with temperature for 

(i) conductors (ii) semi-conductors (iii) alloys.

HARD
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 6
Define and write units of specific resistance and specific conductance. Some mass of a metal wire is drawn in two wires in such a way that second one is double in thickness. Compare the resistances.
HARD
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 7
Show that effective resistance in series combination increases. While that in parallel combination decreases. Two wires of iron and copper of same dimensions are connected in series. The iron wire burns out but the copper wire not even visible glow.Explain.
HARD
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 1
A current of 20 μA flows in a wire for 30 seconds. Find the amount of charge and the number of free electrons transferred through the wire. 
HARD
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 2

A current of 1 A is flowing through a conductor. How many electrons pass through any cross-section of the conductor per second ?

 

HARD
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 2
A current of 1 A is flowing through a conductor. How many electrons pass through any cross-section of the conductor in 1.6 second?
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 3
The cross-sectional area of a wire is 1.0 × 10-7  m2 and the density of free electrons is 2.0 × 1028 m-3. What will be the drift velocity of  the free electrons for a current of 3.2 A in the wire?
HARD
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 4
90 C charge flows for 75 minutes in silver wire of diameter 1.0 mm. The free-electron density in the wire is 5.8 × 1028 m-3. Find the current and the drift velocity of free electrons in the wire.