Page 1 : MP Board Important Questions 2022, Subject: Physics (Class 12th), Unit Wise (According to deleted syllabus 2021 – 22), Prepared By: Abuzar Ghori (M. Sc. Physics) ("The Meritorious" YouTube Channel), Date: 14-11-2021, Unit 1 Electrostatics, What are the dielectrics? Explain polar and nonpolar dielectrics with, example., What do you mean by capacitance of a conductor? Explain the factors, affecting the capacity of a capacitor?, Draw the labelled diagram and derive the expression for the equivalent, capacitance when the capacitances are connected in: (M. Imp.), 1., 2., 3., i., Parallel, ii., Series, 4., What is meant by electric flux? Write its SI unit and dimensional, formula., State and proof Gauss theorem and use it to derive Coulomb's invers, square law. (M. Imp.), What do you mean by electric dipole? Derive and expression for the, electric field intensity due to, An electric dipole at axial position at a point. (M. Imp.), б., i., At a, zero. (M. Imp.), Establish the formula for capacity of parallel plate capacitance of partially, dielectric. (M. Imp.), Establish the formula for capacity of spherical capacitór., Deduce the electric potential at any point due to point charge., ii., point on transvers (equatorial) position of an electric dipole is, 7., 8., 9., Not, Ünit 2 Current Electricity, Definitions: Electric current and its unit, Ohm's law, electric cell, EMF,, resistivity, Mobility., Explain the principle of potentiometer. How is a potentiometer superior, 1., 2., to that of a voltmeter?, ass, Shill

Page 2 : What is drift velocity? Establish a relation between the Drift velocity and, current density. (M. Imp.), State and explain Kirchhoff's laws in current electricity. (M. Imp.), Write four points of difference between e.m.f. (Electromotive Force) and, potential difference., Three resistors are joined in series/parallel. Draw the labelled diagram, and obtain expression for its equivalent resistance., If the length of wire is doubled after stretching, then what will be its, resistance? (M. Imp.), How cells are combined in parallel/series? Derive the expression for, current flowing in the external circuit. When is this combination useful?, Explain the principle of Wheatstone bridge with the help of Kirchhoff's, law. (M. Imp.), 4., 5., 7., 8., 9., 10., Establish the relation among electromotive force, terminal voltage and, internal resistance of a cell., 11., Write the comparison between resistance and specific resistance of a, conductor., Draw the labelled diagram of :, (M. Imp.), Describe the experiment to compare the emf of two cells / to find the, internal resistance of a cell using potentiometer under the following, points. (M. Imp.), Labelled Electric circuit diagram., 12., heter bridge. On what principle it works?, 13., i., ii., Derivation of formula, 111., Observation of table, Two precautions., Numericals:, A Leclanche cell gets a balanced point at 280 cm in potentiometer. A, Denial cell is connected in series to Leclanche cell then a balance, ige, point is obtained at 480 cm. Compare the emf c, two cells., ii., How should the resistances 23 and 6.ohm be connected so that the, equivalent resistance is 4 ohms? Also draw a diagram of the, combination., iii., Compare the resistance of two bulbs of 50 watts and 200 watts if, they are at the same voltage., 3., 6., Skill

Page 3 : tof current. (M. Imp.), iv., Resistance of a resistance thermometer at 0°C is 6 ohms. At 100°C is, 7 ohm and at unknown temperature is 8 ohms. Find out unknown, temperature., A network of 4-ohm, 4 ohm and 3-ohm resistances are connected to a, 10-volt battery as shown in figure. Compute the equivalent resistance, and current obtained from battery., V., 4S2, 42, ww, The, class, vi., The resistance of the platinum wire of a platinum resistance, thermometer at the ice point is 5 W and at steam point is 5.23 ohm., When the thermometer is inserted in a hot bath, the resistance of the, platinum wire is 5.795 ohm. Calculate the temperature of the bath., vii., In a meter bridge, the null point is found at a distance of 33.7 cm, from A. If now a resistance of 12ohm is connected in parallel with S,, the null point occurs at 51.9 cm. Determine the values of R and S., R, B, A, 100 - 2-, Metre scale, K,, Unit 3 Moving Charges and Magnetism, What is shunt? Explain its principle. (M. Imp.), Obtain an expression for the intensity of magnetic, axis of current carrying circular coil., at a point on the, State Biot Savart's law. Define, With the help of Biot Savart's law, obtain an expression for intensity of, magnetic field near a straight, long current carrying conductor. (M. Imp.), Explain the working principle of moving coil galvanometer with the help, of circuit diagram., Explain how to convers galvanometer into ammeter and voltmeter., 5., 6., Skill

Page 4 : NGO-factor? Write its expression and write the condition for its, Obtain an expression of intensity of magnetic field at the centre of current, carrying circular coil., Derive the expression of intensity of magnetic field inside the solenoid, 7., 8., and toroid., Explain the principle and working of cyclotron., State and prove Ampere's circuital law., Derive the expression of the force acting between two parallel, carrying wires., Derive the expression for torque on a rectangular current loop in a, uniform magnetic field., 9., 10., 11., rent, 12., Unit 4 Electromagnetic Induction and Alternating Current., Establish an expression for mutual induction between two long solenoids., (M. Imp.), Describe a step up and step-down transformer under the following, headings: (i) Labelled diagram (ii) Principal (iii) Energy loss in, transformer (iv) Difference between them. (M. Imp.), An alternating current circuit containing only a capacitor (or only, inductor/resistor). Draw a circuit diagram and derive current, phase, difference and capacitive resistance., In alternating LCR (Or LC/LR/RC) circuit determine the following: (i), Resultant voltage (ii) Impedance of a circuit (iii) Phase difference, between the resultant voltage and current. (iv) write the relationship, between the alternating EMF and current in each of the following ca, when. (M. Imp.)., 1., 2., 1, 1, (i) wL >, wC, (ii) wL <, wC, wC, 5., What, value., maximum, Prove for an AC circuit:, Pav = Vems × Iims × cos Ø (M. Imp.), 6., What is a DC electric motor? Explain its construction and working., Differentiate between self-inductance and mutual inductance., What is a Dynamo? Describe an AC dynamo under the following, headings: (M. Imp.), Principle, Labelled diagram, 7., 8., 9., i., ii., Skill, 3.

Page 5 : iii., Working, Write Lenz's law regarding electromagnetic induction and explain how, Lenz's law is equivalent to the law of conservation of energy., Derive expression for the self-induction of solenoid what factors affect its, value and how? (M. Imp.), What is the principle of choke coil? Why is the current in the choke coil, called wattless current? Write its application in current control., 13. Write Faraday's laws of electromagnetic induction and obtain an, expression of induced EMF., What do you mean by magnetic flux? Write its unit., Two solenoids P and S having self-inductance Li and L2 respectively. If, the coupling between them is ideal then prove that the mutual inductance, 10., 11., 12., 14., 15., VLL2 (M. Imp.), Prove that: Ims = Where Ims and I, have usual meaning., between these coils is M, 16., 17., What are Eddy Currents? Explain the experimental demonstration., Deduce expression for electromotive force induced across the ends of a, 18., conducting rod moving in a uniform magnetic field., Unit 5 Electromagnetic waves and wave optics., What do you mean by polarisation of light? State Brewster's law. (M., Imp.), What do you understand by interference of light? Write the factors, affecting the fringe width of light. (M. Imp.), Explain Huygen's principle of secondary wavelets. (M. Imp.), Deduce the fringe width in Young's double slit experiment. (M. Imp.), Write the differences between interference and diffraction. (M. Imp.), Derive an expression for the height of antenna required to transmit the, 3., 4., 5., 6., V2hR. (M. Imp.), television signal to a distance d on the earth surface d, What are electromagnetic waves? Write their characteristics and nature., Define interference of light. Write any four the necessary conditions for, 7., 8., interference of light. S, e Skel, 9., Definition:, а., Plane of vibration, b., Plane of polarization., c., Polaroid., d., Diffraction of light., Shaill 1, 1.