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1 MUDRA PHYSICAL SCIENCES VOLUME- PART B & C MODEL QUESTION BANK FOR THE TOPICS:. Electromagnetic Theory UNIT-I UNIT-II 7 4. Quantum Physics & Application UNIT-I 8 UNIT-II 97 (MCQs) Part B & C Vol-

2 . Electromagnetic Theory UNIT-I. The path of the particle for a motion in a uniform magnetic field is: a) Helix b) Parabola c) Circular d) Triangular. The path of the particle for a motion in a uniform electric field is: a) Parallel b) Perpendicular c) Parabola d) Circular. The electric potential due to a linearly quadrupole varies inversely as the.of the distance: a) Square b) Cube c) Fourth power d) Fifth power 4. When a negative charge is placed at the centre of the sphere, then the direction of electric field on the Gaussian surface is a) Radially inward b) Radially outward c) Along the tangent to the surface d) None of these 5. In an electromagnetic wave, the direction of magnetic field induction B is a) Parallel to electric field E b) Perpendicular to electric field E c) Antiparallel to pointing vector S d) Random 6. The displacement current arises due to a) Positive charges only b) Negative charges only c) Both positive and negative charges d) Time varying electric field 7. When a conducting sphere is placed in a uniform field its polarisibility is the product of permittivity in free space and the volume of the sphere a) Same b) Twice c) Thrice d) Four times 8. The work done on the charges by the electromagnetic force is equal to the decrease in energy stored in the field, less the decrease in energy stored in the field, less the energy which flowed out through the surface is the statement of a) Gauss s theorem b) Stoke s theorem c) Gauss s divergence theorem d) Poynting theorem 9. The electric field E is a) Normal b) Tangential c) Opposite d) Unrelated to the electric equipotential lines (MCQs) Part B & C Vol-

3 . The field of magnetic vector B is always a) Irrotational b) Solenoid c) Non-solenoidal d) Both irrotational and non-solenoidal. The electric dipole moment (p) is a vector, it points a) From positive to negative charge b) From negative to positive charge c) Uncertain d) None of these. The potential which exhibit the dependence of the potentials on the velocity of the particle is known as a) Scalar potentials b) Vector potentials c) Lienard-Wiechert potential d) Retarded potentials. The magnetic flux density at the end of a one metre long solenoid carrying a current of I amp and having N turn will be a) NI b) NI 4k I NI NI c) d) R I 4. The magnetic scalar potential for a point on the z-axis of a circular loop of radius a is given by a) z I / b) 4 a z z I / 4 a z c) z I d) a I / / 4 a z 4 a z 5. The electric field intensity on the surface of a charged conductor is a) Zero b) Directed normally to the surface c) Directed tangentially to the surface d) Directed along 45 to the surface 6. A free electron is placed in the path of a plane electromagnetic wave. The electron will start moving a) Along the electric field b) Along the magnetic field c) Along the direction of propagation of the wave d) In a plane containing the magnetic field and the direction of propagation 7. An infinitely long closely wound solenoid carries a sinusoidally varying current. The induced electric field is a) Zero everywhere b) Non-zero inside and zero outside the solenoid c) Non-zero inside as well as outside the solenoid d) Zero inside and non-zero outside the solenoid (MCQs) Part B & C Vol-

4 8. The pointing theorem is a mathematical statement of the conservation of a) Momentum b) Charge c) Electromagnetic energy d) States 9. The electric flux density D is a) Normal b) Tangential c) Opposite d) Unrelated to the electric flux lines. The electric vector E and magnetic vector H inside a conductor a) Remains in phase b) Are never in phase c) Phase depends on conductivity of the medium d) None of these. 4 A radio wave has a maximum electric field intensity Vm on arrival at a receiving antenna. The maximum magnetic flux density of such a wave is a) Zero b) 4 T 9 c) 5. 8 T d). T. The energy of e.m. wave in vacuum is given by relation E B a) b) E B c) E B C (MCQs) Part B & C Vol- d) E. Magnetic vector potential A is related to electrostatic potential V through the relation V V a) div A b) div A t t V V c) curl A d) curl A t t 4. A monochromatic electromagnetic waves means that a) The field strength at a point varies with time according to sine or cosine function b) The wave always travels in the same direction c) Electric field vector E lies in one direction only d) Magnetic field vector B must be perpendicular to the direction of propagation 5. Which is the incorrect statement about the e.m. wave? a) The electromagnetic field vector E and B re mutually perpendicular and they are also perpendicular to the direction of propagation of electromagnetic waves b) The field vector E and H are in same phase c) The field vectors E and H are along the same direction d) Electromagnetic waves are transverse in nature B

5 6. Two charges q and q are placed close to each other. If a third charge q is brought near it, the force now exerted by q and q a) Increases b) Decreases c) Remains the same d) Reduced to practically zero 7. In a dielectric the polarization is a) Linear function of applied field b) Square function of applied field c) Exponential function of applied field d) Logarithmic function of applied field 8. Consider the reflection and refraction of a plane wave at a dielectric interface which of the following is true? a) The frequency of the wave does not change b) The energy of the wave does not change c) The polarization does not change d) The momentum of the wave does not change 9. If a proton is moved against the coulomb force of an electric field a) Work is done by the electric field b) Energy is used from some outside source c) The strength of the field is decreased d) The energy of the system is decreased. If V, W, q stand for voltage, energy and charge then V can be expressed as a) V b) V c) dv d) dv. An electric field applied along the length of a long cylinder produces a polarization P. The depolarization field produced in this configurations is 4P 4P a) b) c) P d). Consider an electron of charge e moving in a circular orbit of radius a about a charge e in a field directed at right angles, to the plane of orbit, the polarisability is approximately a) 4 a b) 4 a c) 4 a d) a. If E ie, then the electromagnetic wave is a) Plane polarised b) Circularly polarised c) Elliptically polarised d) Unpolarised 4 (MCQs) Part B & C Vol-

6 4. For an anisotropic dielectric media, the relative permittivity is a a) Scalar quantity b) Vector quantity c) Tensor quantity d) None of these 5. When a charge particle moves in uniform electric field, the force acting on it is a) Perpendicular to the direction of field b) Along the direction of field c) Opposite to the direction of field d) None of these 6. The Gaussian surface needed for determining the electric filed due to a charge distribution is a) Any surface around the charged distribution b) Any closed surface around the charge distribution c) A symmetrical closed surface which is such that the intensity of electric field has a normal component which is either zero or has a single constant value at every point on the surface. d) None of the above 7. The direction of propagation of electromagnetic wave is given by a) E. B b) E c) B d) E B 8. The electric field E at the centre of a uniformly charged conductor is qr q a) b) 4 R 4 r q c) Zero d) 4 R 9. Eight electric dipoles of charges of magnitude are placed inside a cube. The total electric flux coming out of the cube will be 8e 6e a) b) e c) d) Zero 4. Consider the given statements about Er,t and B r,t respectively in a region of free space P Both E and B are conservative vector fields Q Both E and B are control force fields R E and B are mutually perpendicular in the region S Work done by B on a moving charge in the region is zero, the electric and magnetic vectors Continued on: Page 6 onwards 5 (MCQs) Part B & C Vol-

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