The plot of current I (A) flowing through a metallic conductor versus the applied voltage V (volt) across the ends of a conductor is:
1. | |
2. | |
3. | 4. |
1. | 81 Ω | 2. | 9 Ω |
3. | 729 Ω | 4. | 243 Ω |
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) |
1. | current density | 2. | current |
3. | drift velocity | 4. | electric field |
A charged particle having drift velocity of 7.5×10−4 ms−1 in an electric field of 3×10−10 Vm−1, has mobility of:
1. 2.5×106 m2V−1s−1
2. 2.5×10−6 m2V−1s−1
3. 2.25×10−15 m2V−1s−1
4. 2.25×1015 m2V−1s−1
As the temperature of a metallic resistor is increased, the product of its resistivity and conductivity:
1. increases
2. decreases
3. remains constant
4. may increase or decrease
1. | reactance | 2. | mobility |
3. | conductivity | 4. | conductance |