AIPMT 2001 | Current Electricity Question 104 | Physics

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

AIPMT 2000

MCQ (Single Correct Answer)

-1

The potentiometer is best for measuring voltage, as

it has a sensitive galvanometer and gives null deflection

it has wire of high resistance

it measures p.d. in closed circuit

it measures p.d in open circuit.

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