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Ki in relation Q = ne which value Is not, possible for n ?, (a) 4 (&) 8 (c) 42 (dd), 2. Surface density of charge Is, (a) Total charge ~ total area, (b) Total charge / total area, (c) Total charge * total volume, (d) Total charge/ total volume, 3. When a liquid drop is charged then ability of, its compression(a) increases, (c) remains unchange (d), 4, SI unit of electric flux is, , 100, , (b) decreases, none of these, , (a) Om (b) Am (c) Vm (d) Vm", , 5. Value of «, in alr Is, (a) zero (b) Infinity, , (c) 1 (d) 9 x 10°, , 6, Force ecing et e charge in electric fleld is, fa) aE W)a/E Kc) E/q (d) voe, , 7. Dielectric constant (c,) of a medium is, fae /ep (b)e Xag, (Qe +9 (d)e - ep, , 8. Dielectric constant of water is, , (a) 80 (o)60 (qh aa (d) 42.5, , 3, 9. Value of =,", , (s) 9« 10° Nm* C* (db) 9x 107 Nm? C*, (©) 9« 10% Nm* C* (4) 9x 10 Nm? Cc?, 10. Which of following is not a fundamental, , particle, , (2) Neutron (b) proton, , (c) alphe particle (d) electron, , 11. Coulomb force is, , (2) central force (b ic force, ©) aandb a of these, alue of quantum charge in esu is, , re 48x10" 4.78 x 10°”, , (©) 2.99 x 10* ) taxion, 13 chug moving wih cost vel then, , & } only clectric field (b) only, os ff) eectioamnanetic Bold d) none of these, ei 10" fo 9x 10°, (c) 8.85x10" —(d) none of these, 15. Specific ci of electron is, (8 1 (b) 1.8x 10"C/kg, bs (ce) 18x Loa 1 pres of fens, a) a, 10" 3* 104, om wnt “9 1/3 « 107, a) x-ray Al, 3 neue Omar, , TRY =, & 4, Crash Course 2022__Chapter—1__ ( ELECTRIC C HARGE AND ELECTRIC FIELD ), , ie field |, , , , Page -( 5, 18. If charge at a sphere is 10 microcoulomb then, electric flux at its surface is, (0) 3n* 10¢ Nm (b) 360 * 104 Nc, (c) 36m = 10¢ Nav/o? (d) 36n * 10* Nm'/c, 19, SI unit of electric dipole moment is, (a) Cm (b) Cm? (e) Car! (d) Cm?, 20, Dielectric constant of free space is, (a)9x 10° m/P (b) 16x10" C, (c) 885x10Fm! (d) 8.85x 10° Fm', 21. There is an electric dipole having charges, + 3.2 * 10-C and - 3.2 * 10-°C If distance, between them is 2.4« 10»m then electric, dipole moment is —, (a) 7.68 « 107Cm (b) 7.68 « 107 Cm, (¢) 7,86 * 107Cm (d) 7.86 *107Cm, 22. Electric field at a point at surface of a charged, conductor is, (a) zero (b) perpendicular to surface, (c) tangential at surface (d) at 45° with surface, 23. SI unit of electric field is, , (a) NC* (6) Ver!, (c) both a and b (d) none, 24. Which is not deviated in electric field and magnetic, field, (a) Electron (b) Proton, (c) Neutron (ad) Alpha particle, 25, What is charge of proton in coulombs, (@) 41.6 ~ 10"C (b) 9.1 « 10", (©) -1.6 «10°C (d) Proton, , 26. Beta particles are deflected in, (a)gravitational field only (b) magnetic field only, , (c) electric field only, (d) both magnetic and electric field, 27. SI unit of permittivity( Eq) is, (a) C/Nm (b) Nm2 (C2, (c) C2¢Nm2 (a) C2/(Nm)?, 28. Which is not unit of electric field intensity ?, (a) NC (0) V fm, (©) JIC (d) JC-lm-!, 29. Number of electrons emitted to store charge of, 1 coulomb is, (a) 6.23 « 104 (b) 6.25 « 1", (ec) 6.023. tom (@) none, 30, when charge is given to a sphere of insulating, substance then it distributes, (>) At surface (>) Inside, , (o) at surface and inside (@) None of these, , 31, torque acting at a dipole having dipole moment P in, electric fleld B is, , (a) PxE (b) P.E, , (c) P+E (d) P-E, , 32. Charge at centre of a cube is Q . Electric flux at its, one surface is, , (0) Q/E, =) Q/6E, () Q/2E, WW) -Q/E,, , , , SCS |, , |\[ 33, , , , , , E, , | 34, |, |, ', ', 35., , 37., , 38., , |} 39.

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1 ‘FUN 2 = ELECTRIC CHAR, 12°-Crash Course 2022 _ Chapter —1 (7 —T48. Dimensions of Ke/Gmym, are, , [33 Charge at centre 0, of the cube is, more, © Q/68, (0) Q/28, @ 2/8,, 34. An static charge oan produce, (a) Only magnetic field (b) Only elect, (c) Both magnetic and electric field, (d) Neither magnetic nor electric field, 35. A dipole is kept in uniform electric field then, resultant clectric force acting at the dipole is, (a) Always zero (a) Never should be zero, (a) Depends on strength of dipole (d)None of these, 36. At what angle two electric field lines are intersected, to each other, a) ws®—(e) 30, (d) never intersect, 37. The force acting between two electrons, separated by distance r is proportional to, @r OF @©r? @r, 38, The dimensional formula for electric flux is, (@) MUP ) MUTT, (MLTR @ MUTT", , fa cube is Q . Total Electric flux, , tric field, , 0, , sheet of charged conductor is, , (a) ove, (b) Gr2g, (Close, (d)0, 40. In the figureifnet forceon Q, , Q is zero then value of Qiq is, , 2 @&) 2/2, , (91252 @We, 41, When a body is charged then its mass, , (a) increases (b) decreases, , (c) may be increase or decrease, , (a) remains Same, 42. If two charges are taken from air to dielectric, , medium then force between them, , (a) increases (b) decreases, , (c) may be increase or decrease, , (4) remains same, ro constant of an insulating material, can, , 2, , , , oO”, , what will be force between them, (a) double (b) four times, (c) halved (4) one fourth, , 45. Dielectric constant of metal is, (a) 0 (©) 1 (©) more than! (d) infinity, , in uniform electric field is, @oO 1 (mm — () mém, 47. Dimensions of permittivity are, (a) M'L°Pl (b) MDT?, (c) M' Le Ts? (d) MLT+I2, , , , 39. The electric field at a point near an infinite thin 5, , (a) -1 ® 90 @os (asf, 44. If distance between two charges be double then, , 46. Ratio of acceleration of an electron and proton ,, , , , GEAND ELECTRIC FIELD) Page -(6), , (a) MLT'A (b) ML?T?A*, (c) M°L*T*A® (4) MLT?, 49, SI unit of surface charge density is (a) Cm? (6) Nm! (Cv! (4) Cm, 50. If electre dipole is kept inside to a spherical, surface then total electric flux emerges through, this surface is, (a) Q/6 & (b) Q/e0, (c) 2Q/ (4) 0, 51. Electric fleld near a charged plane conductor is, , (a) of6, (b+) 0/2€, @20/8, @) axe,, , WER, 1. Write down the unit and dimension of permittivity, of vacuum, 2. Write limitations of Coulomb's law, 3. Write fundamental properties of electric charge, 4. Define electric field intensity and write its SI unit, 5. What do you mean by electric field lines ?, 6.Why two electric field lines never cross to, each other ?, 7, What is electric dipole moment ? write its SI unit., 8. Force acting at a point kept at axis of an, electric dipole is F. If distance of the point from, the dipole is doubled then what will be value of, force?, 9. Write Gauss-theorem of electrostatics., 10. What do you understand by electric flux ?, 11, Does an uncharged pith ball can be attracted by, a charged rod ? explain, 12, An electric dipole is kept in uniform electric, field of intensity 2 x 10* N/C at angle of 30°., Tt experience a torque of 18 x 10 Nm then, find dipole moment., 13. Explain superposition principle of force acting, at a charge by group of charges, 14, What is quantization of charge explain, 15, When two point charges are at distance d then, foree between them is F, what should be, distance If force is F/3 ?, 16, Define volume charge density and write its, SI unit ?, , LONG ANSWER TYPE QUESTIONS, 17, Write Gauss Theorem. Obtain electric field due, to thin straight wire on using Gauss Theorem., 18, Define electric flux. Write Gauss Theorem and, , verify it,, THANKS