1. | \(1\) A | 2. | \(2\) A |
3. | \(4\) A | 4. | Infinite |
The current \(I\) as shown in the circuit will be:
1. | \(10~\text{A}\) | 2. | \(\dfrac{20}{3}~\text{A}\) |
3. | \(\dfrac{2}{3}~\text{A}\) | 4. | \(\dfrac{5}{3}~\text{A}\) |
A meter bridge is set up to determine unknown resistance \(x\) using a standard \(10~\Omega\) 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. \(10.2~\Omega\)
2. \(10.6~\Omega\)
3. \(10.8~\Omega\)
4. \(11.1~\Omega\)
1. | \(28\) C | 2. | \(30.5\) C |
3. | \(8\) C | 4. | \(82\) C |
The resistivity of iron is 1 × 10–7 ohm – m. The resistance of iron wire of particular length and thickness is 1 ohm. If the length and the diameter of wire both are doubled, then the resistivity in ohm – m will be :
1. 1 × 10–7
2. 2 × 10–7
3. 4 × 10–7
4. 8 × 10–7
The temperature coefficient of resistance for a wire is 0.00125/°C. At 300K its resistance is 1 ohm. The temperature at which the resistance becomes 2 ohm is
1. 1154 K
2. 1100 K
3. 1400 K
4. 1127 K
The resistivity of a wire :
1. | Increases with the length of the wire |
2. | Decreases with the area of cross-section |
3. | Decreases with the length and increases with the cross-section of the wire |
4. | None of the above statement is correct |
Drift velocity \(v_d\) varies with the intensity of the electric field as per the relation:
1. \(v_{d} \propto E\)
2. \(v_{d} \propto \frac{1}{E}\)
3. \(v_{d}= \text{constant}\)
4. \(v_{d} \propto E^2\)
In a conductor 4 coulombs of charge flows for 2 seconds. The value of electric current will be :
1. 4 volts
2. 4 amperes
3. 2 amperes
4. 2 volts