Q. What is an amplifier? Draw the simple circuit of transistor amplifier in CE mode.

Q. Draw the variation of magnetic field (B) with magnetic intensity (H) when a ferromagnetic material is subjected to a cycle of magnetisation.

Q. Drive an expression for Electric field due to an Electric dipole at a point on the axial line.

Q. Define magnetisation of a sample.

Q. What is myopia? How to correct it?

Q. Write three properties of ferromagnetic materials.

Q. Drive an expression for drift velocity of free electrons in a conductor.

Q. Give the wavelength range of X-rays.

Q. What are isotopes and isobars?

Q. Mention the types of transmission media.

Q. In the following nuclear reaction, identify the particle X.
$n\to p+e^{-}+X$.

Q. Write the experimental observations of Photoelectric effect.

Q. Derive the condition for balance of a Wheatstone's bridge using Kirchhoff's rules.

Q. Explain briefly the coil and magnet experiment to demonstrate electromagnetic induction.

Q. Derive the expression for energy stored in a charged capacitor.

Q. How can the resolving power of a telescope be increased?

Q. Draw the circuit symbol of p-n-p transistor.

Q. What is a cyclotron?

Q. Write three characteristics of nuclear forces.

Q. Derive an expression for the force between two parallel conductors carrying currents. Hence define ampere.

Q. What is an electric dipole?

Q. Mention two application of polaroids.

Q. What is a transformer? Mention two sources of energy loss in a transformer.

Q. Write an expression for the displacement current.

Q. Write two properties of electric field lines.

Q. What is a toroid? Mention an expression for magnetic field at a point inside a toroid?

Q. State Faraday's law of electromagnetic induction.

Q. Write the logic symbol and truth table of NAND gate.

Q. How does the power of lens vary with its focal length?

Q. The current in a coil of self inductance 5 mH changes from $2\cdot 5$ A to $2\cdot 0$ A in $0\cdot 01$ second. Calculate the value of self induced emf.