The current in a wire varies with time according to the relation i= (3+2t) A. The amount of charge passing a cross section of the wire in the time interval t=0 to t=4.0 sec would be: (where t is time in seconds)
1. | 28 C | 2. | 30.5 C |
3. | 8 C | 4. | 82 C |
In the circuit shown, the value of each of the resistances is r. The equivalent resistance of the circuit between terminals A and B will be:
1. (4/3)r
2. 3r/2
3. r/3
4. 8r/7
Drift velocity vd varies with the intensity of electric field as per the relation:
1.
2.
3. vd = constant
4.
If a metallic block has no potential difference applied across it, then the mean velocity of free electron is:
(T = absolute temperature of the block)
1. | proportional to T. | 2. | proportional to\(\sqrt{\mathrm{T}} \) |
3. | zero. | 4. | finite but independent of temperature. |
A wire of resistance R is divided into 10 equal parts. These parts are connected in parallel, the equivalent resistance of such connection will be:
1. 0.01R
2. 0.1R
3. 10R
4. 100R
In the figure, the value of resistors to be connected between C and D so that the resistance of the entire circuit between A and B does not change with the number of elementary sets used is:
1. R
2.
3. 3 R
4.
A battery of e.m.f. 10 V is connected to resistance as shown in the figure below. The potential difference between the points A and B is:
1. –2 V
2. 2 V
3. 5 V
4.
What is the equivalent resistance of the circuit?
1. 6 Ω
2. 7 Ω
3. 8 Ω
4. 9 Ω
If each resistance in the figure is 9 Ω, then the reading of the ammeter is:
1. 5 A
2. 8 A
3. 2 A
4. 9 A
Equivalent resistance across terminals A and B will be:
1. 1 Ω
2. 2 Ω
3. 3 Ω
4. 4 Ω