Derive the expression for the torque experienced by a bar magnet placed in a uniform magnetic field. Discuss how the potential energy of the magnet varies with the angle between the field and the magnetic moment.
Using Gauss’s law, derive the expression for the electric field intensity around a long, straight wire carrying a uniform charge density.
Which of the following is the best description of Fundamental Rights?
a) All the rights an individual should have.
b) All the rights given to citizens by law.
c) The rights given and protected by the Constitution.
d) The rights given by the Constitution that cannot ever be
restricted.
List Maxwell’s four equations and explain how they lead to the conclusion that electromagnetic waves propagate at the speed of light.
Describe the diffraction pattern observed with a single slit. Explain how the pattern changes with increasing slit width and derive the condition for the position of minima.
The work function of a metal is 2.5 eV. Calculate the maximum kinetic energy of electrons ejected when light of wavelength 400 nm falls on the metal.
Using Bohr’s model, derive the expression for the energy levels of a hydrogen atom. Calculate the wavelength of light emitted during a transition from the third to the second energy level.
Write true or false against each of these statements:
a) A Bill of Rights lays down the rights enjoyed by the people of a
country.
b) A Bill of Rights protects the liberties of an individual.
c) Every country of the world has a Bill of Rights.
d) The Constitution guarantees remedy against violation of Rights.
An ideal gas is compressed at a constant temperature until its volume is halved. Explain how its pressure changes and calculate the work done on the gas if P = 100kPa and V = 2m^3.
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