In the circuit shown in figure find the value of r(internal resistance of the cell) for which power transferred by the cell is maximum
1.
2.
3.
4.
Difficulty Level:
If the voltage across a bulb decreases by 1%, then the percentage change in its power output is :
(1) 1%
(2) 4%
(3) 2%
(4).5%
Difficulty Level:
If a resistance coil is made by joining in parallel two resistances each of 20. An emf of 2V is applied across this coil for 100 seconds. The heat produced in the coil is
(1) 20 J
(2) 10 J
(3) 40 J
(4) 80 J
Difficulty Level:
Difficulty Level:
Difficulty Level:
The equivalent resistance across AB is :
1. 2R
2. R/2
3. 4R/3
4. 3R/2
Difficulty Level:
The equivalent resistance between points A and B in the circuit shown in the figure is
1. 6R
2. 4R
3. 2R
4. R
Difficulty Level:
The drift velocity of the electrons in a current-carrying metallic conductor is of the order of
1.
2.
3.
4.
Difficulty Level:
In the circuit shown in the figure, the effective resistance between A and B is
1. 2
2. 4
3. 6
4. 8
Difficulty Level:
For the circuit shown in the figure, the value of R must be
1. 3
2. 4
3. 5
4. 6
Difficulty Level: