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NEET UG PHYSICS MCQ: CURRENT ELECTRICITY

1 Hard

1 of 1

Application +4 | -1

In a simple metre-bridge circuit, the gaps are bridge by coils

P

and

Q

having the smaller resistance. A balance is obtained when the jockey key makes contact at a point of the bridge wire 40 cm from the

P

end. On shunting the coil

Q

with a resistance of

50 \Omega,

the balance point is moved through 10 cm. The resistance

P

and

Q

are

View answer and explanation

Correct option: B

\frac{50}{3} \Omega, \frac{50}{2} \Omega

respectively

Option B (

\frac{50}{3} \Omega, \frac{50}{2} \Omega

respectively) is correct because it satisfies the conditions of the meter bridge circuit before and after shunting the coil Q.

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In the absence of applied potential, the electric current flowing through a metallic wire is zero because A metallic block has no potential difference applied across it, then the mean velocity of free electrons at absolute temperature

T

is In a thermocouple, which of the following statements is not true (A) The drift velocity of electrons decreases with the increase in the temperature of conductor.
(B) The drift velocity is inversely proportional to the area of cross-section of given conductor.
(C) The drift velocity does not depend on the applied potential difference to the conductor.
(D) The drift velocity of electron is inversely proportional to the length of the conductor.
(E) The drift velocity increases with the increase in the temperature of conductor.
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\mathrm{quantity}\,\,\mathrm{/}\,\mathrm{quantities}

constant along the length of the conductor

\mathrm{is}\,\,\mathrm{/}\,\,\mathrm{are}