EASY
12th CBSE
IMPORTANT
Earn 100

Between two successive collisions, each free electron acquires a velocity from 0 to v wherev=eEmτ.  What is the average velocity of a free electron in the presence of an electric field? Do all electrons have the same average velocity?

Important Questions on Current Electricity

EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>HOTS Problems on Higher Order Thinking Skills>Q 3
How does this average velocity of the free electrons, in the presence of an electric field vary with temperature?
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>HOTS Problems on Higher Order Thinking Skills>Q 4
Is current density a vector or a scalar quantity? Deduce the relation between current density and the potential difference across a current-carrying conductor of length l, area of cross-section A, and number density of free electrons n. How does the current density, in a conductor vary with increase in potential gradient?
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>HOTS Problems on Higher Order Thinking Skills>Q 4
Is current density a vector or a scalar quantity? Deduce the relation between current density and the potential difference across a current-carrying conductor of length l, area of cross-section A, and number density of free electrons n. How does the current density, in a conductor vary with increase in temperature?
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>HOTS Problems on Higher Order Thinking Skills>Q 4
Is current density a vector or a scalar quantity? Deduce the relation between current density and the potential difference across a current-carrying conductor of length l, area of cross-section A, and number density of free electrons n. How does the current density, in a conductor vary with increase in length?
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>HOTS Problems on Higher Order Thinking Skills>Q 4
Is current density a vector or a scalar quantity? Deduce the relation between current density and the potential difference across a current-carrying conductor of length l, area of cross-section A, and number density of free electrons n. How does the current density, in a conductor vary with increase in area of cross-section? (Assume that the other factors remain constant)
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>HOTS Problems on Higher Order Thinking Skills>Q 5
A battery of emf 2 V and internal resistance 0.1 Ω is being charged by a current of 5 A. What will be the direction of current inside the battery? What is the potential difference between the terminals of the battery?
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>HOTS Problems on Higher Order Thinking Skills>Q 6

Twenty electric bulbs are connected in series with the mains of a 220 V supply. After one bulb is fused, the remaining 19 bulbs are again connected in series across the same mains. What will be the effect on illumination?

EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>HOTS Problems on Higher Order Thinking Skills>Q 7

In an electric kettle, water boils in 20 minutes after the kettle is switched on. With the same supply voltage if the water is to boil in 10 minutes, should the length of the heating element be decreased or increased?