KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 258 - 260 of 268

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Question number: 258

» Electromagnetic Induction & Alternating Currents » Faraday's Law

Appeared in Year: 2016

MCQ▾

Question

Two infinitely long parallel wires carry current of magnitude and and are at a distance apart. The magnitude of the net magnetic field is found to reach a non – zero minimum value between the two wires and away from first wire. The ratio of the two currents and their mutual direction is –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 259

» Electromagnetic Induction & Alternating Currents » Faraday's Law

Appeared in Year: 2016

MCQ▾

Question

A conducting bar of mass and length moves on two frictionless parallel rails in the presence of a constant uniform magnetic field of magnitude directed into the page as shown in the figure. The bar is given an initial velocity towards the right at . Then the:

A conducting bar placed in magnetic field

A Conducting Bar Placed in Magnetic Field

In figure a conducting bar of length l moves on two frictionless parallel rails in the uniform magnetic field.

Choices

Choice (4) Response

a.

Velocity of the bar decreases linearly with time.

b.

Power generated across the resistance is proportional to .

c.

Distance the bar travels before it comes to a complete stop is proportional to .

d.

Induced current in the circuit is in the clockwise direction.

Question number: 260

» Thermodynamics » Concept of Temperature

Appeared in Year: 2009

MCQ▾

Question

A nuclear fuel rod generates energy at a rate of . It is the shape of a cylinder of radius and length . A coolant of specific heat flows past it at a rate of . The temperature rise in the coolant is approximately,

Choices

Choice (4) Response

a.

b.

c.

d.

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