The sensitivity of a potentiometer can be increased by 1.  increasing the potential gradient 2.  decreasing the length of potentiometer wire 3.  decreasing the current in the potentiometer wire 4.  all of these

Subtopic:  Meter Bridge & Potentiometer |
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1.  36V

2.  18V

3.  9V

4.  Zero

Subtopic:  Heating Effects of Current |
64%
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A current of 1 mA is flowing through a copper wire. How many electrons will pass a given point in one second

1.

2.

3.

4.

Subtopic:  Current & Current Density |
78%
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The drift velocity of free electrons in a conductor is $$v$$ when a current $$i$$ is flowing in it. If both the radius and current are doubled, then the drift velocity will be:
1.  $$v$$
2. $$\frac{v}{2}$$
3. $$\frac{v}{4}$$
4. $$\frac{v}{8}$$

Subtopic:  Current & Current Density |
72%
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A battery has emf $$4$$ V and internal resistance $$r$$. When this battery is connected to an external resistance of $$2$$ ohm, a current of $$1$$ ampere flows in the circuit. How much current will flow if the terminals of the battery are connected directly?
 1 $$1$$ A 2 $$2$$ A 3 $$4$$ A 4 Infinite
Subtopic:  EMF & Terminal Voltage |
66%
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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 $$\dfrac{5}{3}~\text{A}$$
Subtopic:  Combination of Resistors |
60%
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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. $$11.1~\Omega$$

Subtopic:  Meter Bridge & Potentiometer |
52%
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The resistance of platinum wire at 0$°\mathrm{C}$ is 22.05 $\mathrm{\Omega }$ and at 100$°\mathrm{C}$ it becomes 22.70 $\mathrm{\Omega }$. When the wire is heated to a temperature of t$°\mathrm{C}$ the resistance of wire becomes 24.91$\mathrm{\Omega }$. The value of t is

1.  220

2.  440

3.  310

4.  550

Subtopic:  Derivation of Ohm's Law |
62%
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If I be the current limit of a fuse wire of length l and radius r, then select the appropriate relation

(1)

(2)

(3)

(4)

Subtopic:  Heating Effects of Current |
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Which of the following graph correctly represents the variation of mobility $$(\mu)$$ of electrons with applied electric field $$(E)$$ in a metallic conductor?

 1 2 3 4
Subtopic:  Current & Current Density |
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