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(Q.1) What is the direction of electric field intensity at a point on equatorial line of dipole? ( 1 mark ) View Answer (Q.2) Define electric dipole moment? ( 1 mark ) View Answer (Q.3) Define electric field intensity? ( 1 mark ) View Answer (Q.4) When does a dipole experiences maximum torque placed in uniform electric field? ( 1 mark ) View Answer (Q.5) What happens when an electric dipole is placed in non uniform electric field? ( 1 mark ) View Answer (Q.6) What is the value of electric field intensity inside a charged conductor? Why? ( 1 mark ) View Answer (Q.7) Explain, why two electric lines of forces cannot intersect each other. ( 1 mark ) View Answer (Q.8) Howcan wecharge a body? ( 1 mark ) View Answer S1and S2are two parallel concentric spheres enclosing charges Q and 2 Q respectively as shown in Fig.The ratio of the electric flux through S1and S 2 (Q.9) ( 1 mark ) (A) (B) (C) (D) View Answer (Q.10) A charged particle having a charge of –3μC is placed close to a sheet of charge having a surface charge density 5 × 10–6C m–2.The force of attraction between the particle and the sheet of charge will be ( 1 mark ) (A) 0.487 (attractive) (B) 0.487 N (attractive) (C) 0.847 N (repulsive) (D) 0.847 N (attractive) View Answer (Q.11) A large plane sheet of charge having surface charge density 5.0 × 10–6C m–2lies in the XY- plane. Find the electric flux through a circular area of radius 0.1 m, if the normal to the circular area makes as angle of 60° with Z-axis. Given that –12C2N–1 m–2 0= 8.85× 10 ( 1 mark ) (A) 4.44 × 103Nm2C–1 (B) 2.44 × 103Nm2C–1 (C) 4.22 × 103Nm2C–1 (D) 2.22 × 103Nm2C–1 View Answer (Q.12) An infinite line charge produces a field of 9 × 104NC–1at a distance of 4 cm. Calculate the linear charge density. ( 1 mark ) 10–7Cm–1 (A) 2 × (B) 0.04 × 10–7Cm–1 (C) 4 × 10–7Cm-1 (D) 0.2 × 10–7Cm-1 View Answer (Q.13) The electric field inside a spherical shell of uniform surface charge density ( 1 mark ) is : (A) zero (B) constant, different from zero (C) proportional to the distance from the curve (D) none of these View Answer The electric dipole is situated in an electric field as shown in fig (i). The dipole is rotated about an axis perpendicular to the plane of the paper about its axis at the point A in anticlockwise direction. If the angle of rotation is measured with respect to the direction of the electric field, then the torque experienced by the dipole for different values of angle of rotation is represented in fig (ii) will be given by (Q.14) ( 1 mark ) (A) Curve (A) (B) Curve (B) (C) Curve (C) (D) Curve (D) View Answer An electric dipole, consisting of two opposite charges of ( 1 mark ) 2 Χ10-6C each separated by a distance 3 cm is placed in an electric field of2 Χ105 N/C. Torque on the dipole is (Q.15) (A) (B) (C) (D) View Answer (Q.16) A point charge +q is placed at mid point of a cube of side ‘L’. The electric flux emerging from the cube is ( 1 mark ) (A) (B) (C) (D) zero View Answer (Q.17) Two identical balls each have a mass of 10 g. What charges should these balls be given so that their interaction equalizes the gravitational force of attraction between them? The radii of the balls may be ignored in comparison to the distance between them. ( 1 mark ) (A) 8.57 × 10–13C (B) 5. 78 × 10 –13C (C) 7.85 × 10–13C (D) 7.58 × 10–13C View Answer (Q.18) Which of the following is/are false statements? (I) An electric charge experiences a force due to the field, it produces itself (II) Two electric lines of force cannot intersect each other ( 1 mark ) (III)The unit of electric dipole moment is mC (A) I and II are false (B) II and III are false (C) I and III are false (D) I, II, III all are false View Answer (Q.19) An oil drop of 12 excess electrons is held stationary under a constant electric field of 2.55 ×104 V m –1in Millikan's oil drop experiment. The density of the oil is 1.26 g cm–3. Estimate the radius of the drop. Given that g = 9.81 m s– 2and e = 1. 6 × 10–19 C. ( 1 mark ) (A) 1.26 × 10–4mm (B) 1.92 × 10–4mm (C) 2.55 × 10–4mm (D) 9.82 × 10–4mm View Answer (Q.20) Calculate the total positive or negative charge on 3.11 g copper penny. Given Avogadro number = 6.02 × 1023 ,atomic number of copper=29 and atomic mass of copper = 63. ( 1 mark ) (A) 2. 95 × 10 22C (B) 85.55 × 1022C (C) 1.37 × 105 C (D) 14.20 × 1041C View Answer (Q.21) A water particle of mass 10.0 mg and having a charge of 1.50 × 10–6C stays suspended in a room.The field will be ( 1 mark ) (A) 6.53 N/C, vertically upwards (B) 6. 53 N/C, vertically downwards (C) 65.3 N/C, vertically upwards (D) 65.3 N/C, vertically downwards View Answer (Q.22) Calculate the electric intensity due to dipole of length 10 cm and having a charge of 500 μC at a point on the axis at a distance 20 cm from one of the charges in air. ( 1 mark ) (A) 32. 5 × 107NC (B) 325 × 106 NC (C) 3.25 × 107NC (D) 3.25 × 106NC View Answer There exists a non-uniform electric field along x-axis as shown in the figure below. The field increases at a uniform rate along +ve x-axis. A dipole is placed inside the field as shown. Which one of the following is correct for the dipole? (Q.23) ( 1 mark ) (A) Dipole moves (B) Dipole moves (C) Dipole moves (D) Dipole moves View Answer along along along along positive x-axis and undergoes a clockwise rotation negative x-axis and undergoes a clockwise rotation positive x-axis and undergoes an anticlockwise rotation negative x-axis and undergoes an anticlockwise rotation The diagram shows the electric lines of forces emerging from a charged body. If the electric field at A and B are E Aand EBrespectively and if the distance between A and B is r, then (Q.24) ( 1 mark ) (A) EA> EB (B) EA= EB/r (C) EA< EB (D) EA= EB/r2 View Answer (Q.25) Two charges (+2 coulomb, –2 coulomb) are placed at a distance 0.5 m. Then their dipole moment will be : ( 1 mark ) (A) 1 Cm (B) 2 Cm (C) 3 Cm (D) 4 Cm View Answer (Q.26) Two charges (1 coulomb each) are placed at a distance 9 × 10–9m. Electric force between them will be ( 1 mark ) 1027 (A) 1/9) × N (B) 1/9) × 10–27N (C) (1/9)N (D) 4 N View Answer (Q.27) An electric dipole is kept in a uniform electric field. it experiences ( 1 mark ) (A) A force and a torque (B) A force, but no torque (C) A torque but no force (D) Neither a force nor a torque View Answer Equal charges q each are placed at the vertices A and B of an equilateral triangle ABC of side a. The magnitude of electric intensity at the point C is (Q.28) ( 1 mark ) (A) (B) (C) (D) View Answer (Q.29) Quantization of charge implies ( 1 mark ) (A) Charge cannot be destroyed (B) Charge exists on particles (C) There is a minimum permissible charge on a particle (D) Charge, which is a fraction of a coulomb is not possible. View Answer (Q.30) What happens when some charge is placed on a soap bubble? ( 1 mark ) (A) Its radius decreases (B) Its radius increases (C) The bubble collapses (D) None of the above View Answer (Q.31) Two spheres A and B of exactly same mass are given equal positive and negative charges respectively. Their masses after charging ( 1 mark ) (A) Remain unaffected (B) Mass of A > mass of B (C) Mass of A < mass of B (D) Nothing can be said View Answer (Q.32) The distinction between conductors, insulators and semiconductor is largely concerned with ( 1 mark ) (A) Their ability to conduct current (B) The type of crystal lattice (C) Binding energy of their electrons (D) Relative widths of their energy gaps View Answer (Q.33) What is the dimentional formula for 0 ? ( 1 mark ) (A) M-2L1T-3A2 (B) M-1L-3T4A2 (C) M1L3T-4A-2 (D) M-3L-1T4A2 View Answer (Q.34) How many charges form 1 coulomb of charge? ( 1 mark ) (A) 6.25x1012 (B) 6.25x1016 (C) 0.625x1012 (D) 6.25x1018 View Answer (Q.35) ( 1 mark ) What is the electric dipole moment of an electron and a proton 4 nm apart. (A) 6.4x10-24 Cm (B) 6.88x10-24 Cm (C) 6.4x10-28 Cm (D) 3.4x10-24 Cm View Answer (Q.36) The potential difference between two points is 20 volt. How much work will be done in carrying charge of 400 μ C from one point to other? ( 1 mark ) (A) 8x10-3 J (B) 2x10-3 J (C) 4x10-3 J (D) 8x10+3 J View Answer (Q.37) Define electric flux, also mention its formula? ( 2 Marks ) View Answer What will be the minimum electrostatic force between two charged particles placed at a distance of 1m apart? (Q.38) ( 2 Marks ) View Answer (Q.39) Define electric dipole moment. Give its direction? ( 2 Marks ) View Answer (Q.40) Define grounding or earthing? ( 2 Marks ) View Answer (Q.41) How is a neutral body electrified? ( 2 Marks ) View Answer (Q.42) What is a gold leaf electroscope? ( 2 Marks ) View Answer An electric dipole, experiences a torque of 24x10-26 Nm. When it is placed 300 w.r.t a uniform electric field of strength ( 3 Marks ) 6x104 NC-1.calculate the dipole moment of the dipole? (Q.43) View Answer A dipole consisting of an electron and a proton separated by a distance 2x10-5m is situated in the electric field intensity of 4x105 NC-1 at an angle of 30 0 with the field. Calculate the dipole moment and the torque acting on it? (Q.44) ( 3 Marks ) View Answer A solid sphere contains a uniformly distributed charge of density . What is the electric field inside the sphere at a distance r from the centre? (Q.45) ( 3 Marks ) View Answer A point charge is placed at the centre of a cube. What is the flux linked, (Q.46) ( 3 Marks ) (a) with the cube? (b) with each face of the cube? View Answer (Q.47) Two point charges +9e and e are kept at distance x apart.At what distance a charge q should be placed from charge+e, so that q is in equilibrium. ( 3 Marks ) View Answer A system has two charges q = 2x10-7 C and q = -2x10-7 C located at points A(0,0,-10cm) and B(0,0,+10cm) respectively.find the total charge and electric dipole moment of the system. (Q.48) ( 3 Marks ) View Answer State coulomb’s law, also derive the formula for the same. (Q.49) ( 3 Marks ) View Answer (Q.50) Mention some basic properties of electric charges? ( 3 Marks ) View Answer (Q.51) Write, in brief, the method to determine the distance of an inferior planet from the earth. ( 3 Marks ) View Answer (Q.52) ( 3 Marks ) “The magnetic lines of force prefer to pass through iron than air.” Give reason, View Answer (Q.53) ( 3 Marks ) Why is the energy of the electron emitted during beta decay continuous? View Answer Give the equation for the charge desity of continuous uniform charge distributions in the case of linear, surface and ( 5 Marks ) volume distribution of charges. (Q.54) View Answer State Gauss law and derive the formula for electric field ( 5 Marks ) intensity of an infinite thin plane sheet of uniform surface charge density . (Q.55) View Answer (Q.56) Mention some important properties of electric field lines? ( 5 Marks ) View Answer Derive the formula for electric field of an electric dipole for the following two cases(a) axial line (b) equatorial line. (Q.57) View Answer ( 5 Marks )