Q. What is displacement current? Obtain an expression of displacement current for a charged capacitor. Write Ampere-Maxwell's law.

Q. Write two characteristics of a material to constructes a permanent magnet. Give two examples of such materials.

Q. Write the SI unit of current density.

Q. What is farsightedness or hypermetropia?

Q. Write definitions.
(i) Transducer.
(ii) Modulation.

Q. A charge q enters perpendicularly with the direction of a magnetic field $\overline{B}$ with a velocity $\overline{V}$. What would be the force acting on this charge?

Q. Write Kirchhoff's first rule. A battery of $10V$ and negligible internal resistance is connected to the diagonally opposite corners of a cubical network consisting of $12$ resistors each of resistance $2\Omega$. Determine the equivalent resistance of the network.

Q. Write the law of radioactive decay. A radioactive nucleus is decaying in the following way. Determine the mass number and atomic number of final product $X_4$. When initial nucleus has mass number $A=238$ and atomic number $Z=92$.
${}_Z^{A}X\stackrel{\alpha }{\to }{X}_1\stackrel{{\beta }^{-}}{\to }{X}_2\stackrel{\alpha }{\to }{X}_3\stackrel{\gamma }{\to }{X}_4$.

Q. Draw the logic symbol of AND gate.

Q. Determine the force acting between two parallel current carrying conductor wires. Write theoretical definition of ampere on this basis.

Q. What is stopping voltage (or cut voltage)? Plot a graph of variation of photoelectric current with collector plate potential for two incident radiations of same frequency and different intensities.

Q. Write two drawback of Rutherford's atomic model.

Q. Draw a diagram of equipotential surface for a single charge.

Q. The radius of curvature of a concave mirror is $40cm$. Determine its focal length.

Q. Write the statement of Bohr's Second postulate of quantisation. Determine the wavelength of first spectral line in the Lyman series of the hydrogen spectrum.[Rydberg constant R$=1.097\times {10}^7{m}^{-1}$].

Q. Why reflecting telescope is superior in comparison to refracting telescope? Write two reasons.
Magnifying power of a telescope is $8$. When it is adjusted for parallel rays the distance between eyepiece and objective lens is $18$cm. Determine the focal length of both the lenses.

Q. Current in a circuit fall from $5.0$A to zero in $0.1$S. If an average emf of $100$ Volt is induced then calculate self-inductance of a inductor in the circuit.

Q. Establish different relations between magnetisation M, magnetic intensity H, magnetic susceptibility X and relavtive magnetic permeability ${\mu }_r$. Define the magnetic susceptibility X.

Q. Draw a labelled diagram of an alternating current Generator. Determine the induced electromotive force by the rotation of coil in it.

Q. Explain skywave propagation by making a diagram.

Q. Determine the resistance of a resistor with the help of given V-I graph.

Q. Which electromagnetic waves are used in remote controller (switches)?

Q. Write Gauss's law. Determine the electric field at the points which are situated outside and inside of a uniformly charged thin spherical shell. Draw necessary diagrams of Gaussian surfaces.

Q. A reflected light becomes completely polarised when corresponding incident angle is ${60}^o$. When light is incident on the substance. Determine the velocity of refracted ray in the medium.

Q. How much energy is required to excite a hydrogen atom from its ground state to second excited state?

Q. Write the definition of electric dipole moment.

Q. Write the two examples of acceptor impurities.

Q. Write the Faraday's law of electromagnetic induction.

Q. The thershold frequency for caesium metal is $5.16\times {10}^{14}$Hz. Determine its work function in eV.

Q. A light bulb is rated at $100$W for a $220$V supply. Find the peak voltage of the source.