| 1. | In the absence of an electric field, the mean velocity of free electrons in a conductor at absolute temperature (T) is ? | |
|
independent of T
|
||
|
proportional to T^2
|
||
|
zero
|
||
|
proportional to T
|
||
View Answer
Discuss in Forum
Report Question| 2. | The Kirchhoff's second law (iR = E), where the symbols have their usual meanings, is based on ? | |
|
conservation of potential
|
||
|
conservation of charge
|
||
|
conservation of energy
|
||
|
conservation of momentum
|
||
| 3. | In the equation AB = C, A is the current density, C is the electric field, Then B is ? | |
|
conductivity
|
||
|
resistivity
|
||
|
potential difference
|
||
|
resistance
|
||
| 4. | Two cells of emfs approximately 5 V and 10 V are to be accurately compared using a potentiometer of length 400 cm. ? | |
|
Potentiometer is usually used for comparing resistances and not voltages.
|
||
|
The battery that runs the potentiometer should have voltage of 8V.
|
||
|
The battery of potentiometer can have a voltage of 15 V and R adjusted so that the potential drop across the wire slightly exceeds 10 V.
|
||
|
The first portion of 50 cm of wire itself should have a potential drop of 10 V
|
||