A current passes through a resistor. Let K1 and K2 represent the average kinetic energy of the conduction electrons and the metal ions respectively.

1.   K1 < K2

2.   K1 = K2

3.   K1 > K2

4.   Any of these three may occur

Subtopic:  Current & Current Density |
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Electrons are emitted by a hot filament and are accelerated by an electric field as shown in the figure. The two stops at the left ensure that the electron beam has a uniform cross-section.

                  

(a) The speed of the electron is more at B than at A.
(b) The electric current is from left to right.
(c) The magnitude of the current is larger at B than at A.
(d) The current density is more at B than at A

Choose the correct option 

1. (a) only 

2. (b), (c) 

3. (c), (d) 

4. (a), (d)

Subtopic:  Current & Current Density |
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When no current is passed through a conductor,

(a) the free electrons do not move.
(b) the average speed of a free electron over a large period of time is zero.
(c) the average velocity of a free electron over a large period of time is zero.
(d) the average of the velocities of all the free electrons at an instant is zero.

Choose the correct option: 
1. (a) only 
2. (b), (c) 
3. (c), (d) 
4. (a), (d) 

Subtopic:  Current & Current Density |
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Electric conduction takes place in a discharge tube due to the movement of

(a) positive ions
(b) negative ions
(c) electrons
(d) protons

Choose the correct option 

1. (a),(b), (c)

2. (b), (c), (a)

3. (c),(d), (b)

4. (a), (d), (b)

Subtopic:  Current & Current Density |
 73%
From NCERT

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