A wire has resistance 24 $\Omega$. It is bent in the form of a circle. The effective resistance between the two point on the diameter of the circle is

(1) 6$\Omega$

(2) 4$\Omega$

(3) 3$\Omega$

(4) 12$\Omega$

Concept Questions :-

Combination of resistors
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The drift velocity of the electrons in a current-carrying  metallic conductor is of the order of

1.

2.

3.

4.  ${10}^{-4}\mathrm{m}/\mathrm{s}$

Concept Questions :-

Current and current density
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In the circuit shown in the figure, the effective resistance between A and B is

1.  2$\mathrm{\Omega }$

2.  4$\mathrm{\Omega }$

3.  6$\mathrm{\Omega }$

4.  8$\mathrm{\Omega }$

Concept Questions :-

Combination of resistors
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For the circuit shown in the figure, the value of R must be

1.  3$\mathrm{\Omega }$

2.  4$\mathrm{\Omega }$

3.  5$\mathrm{\Omega }$

4.  6$\mathrm{\Omega }$

Concept Questions :-

Kirchoff's voltage law
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Difficulty Level:

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)

Concept Questions :-

Heating effect of current
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Difficulty Level:

1.  220

2.  440

3.  310

4.  550

Concept Questions :-

Derivation of Ohm's law
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Difficulty Level:

1.

2.

3.

4.   $4$

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Difficulty Level:

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

Concept Questions :-

Meter bridge and potentiometer
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1.  36V

2.  18V

3.  9V

4.  Zero

Concept Questions :-

Heating effect of current
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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.

Concept Questions :-

Current and current density
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Difficulty Level: