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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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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Difficulty Level:

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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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 drift velocity will be :

1.  v

2.

3.

4.  $\frac{\mathrm{v}}{8}$

Concept Questions :-

Current and current density
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A battery has e.m.f. 4V and internal resistance r. When this battery is connected to an external resistance of 2 ohms, a current of 1 amp. flows in the circuit. How much current will flow if the terminals of the battery are connected directly

1.  1 Amp

2.  2 Amp

3.  4 Amp

4.  Infinite

Concept Questions :-

Emf and terminal voltage
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The equivalent resistance between A and B is:

1.

2.

3.

4.  $12\mathrm{\Omega }$

Concept Questions :-

Combination of resistors
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Difficulty Level: