AIPMT 2002 | Current Electricity Question 103 | Physics

For a cell terminal potential difference is 2.2V when circuit is open and reduce to 1.8 V when cell is connected to a resistance of R = 5 $$\Omega $$. Determine internal resistance of cell (r)

$${{10} \over 9}\Omega $$

$${{9} \over 10}\Omega $$

$${{11} \over 9}\Omega $$

$${{5} \over 9}\Omega $$

AIPMT 2001

MCQ (Single Correct Answer)

-1

If specific resistance of a potentiometer wire is 10^-7$$\Omega $$ m and current flow through it is 0.1 amp., cross-sectional area of wire is 10^$$-$$6 m² then potential gradient will be

10^$$-$$2 volt/m

10^$$-$$4 volt/m

10^$$-$$6 volt/m

10^$$-$$8 volt/m.

AIPMT 2001

MCQ (Single Correct Answer)

-1

Copper and silicon is cooled from 300 K to 60 K , the specific resistance

decrease in copper but increase in silicon

increase in copper but decrease in silicon

increase in both

decrease in both

AIPMT 2001

MCQ (Single Correct Answer)

-1

The resistance of each arm of the Wheatstone's bridge is 10 ohm. A resistance of 10 ohm is connected in series with a galvanometer then the equivalent resistance across the battery will be

10 ohm

15 ohm

20 ohm

40 ohm

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