Physics
GATE PH purpose:exam-prep PYQs
Build your understanding with focused practice from past exam papers.
Questions 551–560 of 650. Imported answers require independent review unless marked reviewed.
Question 21
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An infinitely long straight wire is carrying a steady current I. The ratio of magnetic energy density at distance
to that at
(= 2
) from the wire is ________.Log in to check the answer
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A light beam of intensity
is falling normally on a surface. The surface absorbs 20% of the intensity and the rest is reflected. The radiation pressure on the surface is given by
, where X is ________ (up to one decimal place). Here c is the speed of light.Log in to check the answer
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The number of independent components of a general electromagnetic field tensor is ________.
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If X is the dimensionality of a free electron gas, the energy (E) dependence of density of states is given by
, where Y is ________.Log in to check the answer
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For nucleus
Er, a
state is at 90 keV. Assuming
Er to be a rigid rotor, the energy of its
state is ________ keV (up to one decimal place).Log in to check the answer
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Open questionPHMCQ2 marksNeeds review
Given
and
, which one of the following
makes
a complete set for a three dimensional real linear vector space?Your answerChoose one option.
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An interstellar object has speed
at the point of its shortest distance
from star of much larger mass
. Given
, the trajectory of the object isYour answerChoose one option.
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A particle moves in one dimension under a potential
with some non-zero total energy. Which one of the following best describes the particle trajectory in the phase space?Your answerChoose one option.
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Consider an infinitely long solenoid with
turns per unit length, radius
and carrying a current
, where
is a constant and
is the angular frequency. The magnitude of electric field at the surface of the solenoid isYour answerChoose one option.
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Open questionPHMCQ2 marksNeeds review
A constant and uniform magnetic field
pervades all space. Which one of the following is the correct choice for the vector potential in Coulomb gauge?Your answerChoose one option.
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