The current I as shown in the circuit will be:
1. 10 A
2.
3.
4.
A meter bridge is set up to determine unknown resistance x using a standard 10 resistor. The galvanometer shows the null point when the tapping key is at a 52 cm mark. End corrections are 1 cm and 2 cm respectively for end A and B. Then the value of x is:
1. 10.2
2. 10.6
3. 10.8
3. 11.1
The current through the 5 resistor is:
1. 3.2 A
2. 2.8 A
3. 0.8 A
4. 0.2 A
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.