AIEEE 2005 | Current Electricity Question 325 | Physics

Two sources of equal $$emf$$ are connected to an external resistance $$R.$$ The internal resistance of the two sources are $${R_1}$$ and $${R_2}\left( {{R_1} > {R_1}} \right).$$ If the potential difference across the source having internal resistance $${R_2}$$ is zero, then

$$R = {R_2} - {R_1}$$

$$R = {R_2} \times \left( {{R_1} + {R_2}} \right)/\left( {{R_2} - {R_1}} \right)$$

$$R = {R_1}{R_2}/\left( {{R_2} - {R_1}} \right)$$

$$R = {R_1}{R_2}/\left( {{R_1} - {R_2}} \right)$$

AIEEE 2005

MCQ (Single Correct Answer)

-1

An energy source will supply a constant current into the load if its internal resistance is

very large as compared to the load resistance

equal to the resistance of the load

non-zero but less than the resistance of the load

zero

AIEEE 2005

MCQ (Single Correct Answer)

-1

Out of Syllabus

In a potentiometer experiment the balancing with a cell is at length $$240$$ $$cm.$$ On shunting the cell with a resistance of $$2\Omega ,$$ the balancing length becomes $$120$$ $$cm$$. The internal resistance of the cell is

$$0.5\Omega $$

$$1\Omega $$

$$2\Omega $$

$$4\Omega $$

AIEEE 2005

MCQ (Single Correct Answer)

-1

The resistance of hot tungsten filament is about $$10$$ times the cold resistance. What will be resistance of $$100$$ $$W$$ and $$200$$ $$V$$ lamp when not in use ?

$$20\Omega $$

$$40\Omega $$

$$200\Omega $$

$$400\Omega $$

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