1) A 100 µC charge is at the center of a square of side 5 cm. The work done in moving a charge of 10 µC between two diagonally opposite points on the square a)  9 x 10 ^9 J b) 1.6 x 10^ 16 J c) 10.2 J d) zero 2) 2. If a positive charge is moved from a low potential region to a high potential region, the electric potential energy a) Remain the same b) Decreases c) Increases d) (d) May increase or decrease 3) A particle of mass 10^ -3 kg and charge 5μC enters a uniform electric field of 2 × 10^ 5 NC-1, moving with a velocity of 20 ms^-1 in a direction opposite to that of the field. Calculate the distance it would travel before coming to rest. a) 20.2cm b) 0.2 m c) 15 cm d) 3.2 m 4) Which of the statement is correct for a body charged by induction? a) Body becomes neutral b) Body doest not lose any charge c) Body loses whole of the charge on it d) Body loses part of the charge on it 5) Three charges namely 2q, - q and – q are located at the vertices of an equilateral triangle. Then at the centre of the triangle a) The field is zero but potential is non-zero b) The field is non-zero but potential is zero c) Both are zero d) Both are non-zero 6) A point charge +q is placed at a distance d from an isolated conducting plane. The field at a point P on the other side of the plane is a) Directed perpendicular to the plane and away from the plane. b) Directed perpendicular to the plane but towards the plane. c) Directed radially away from the point charge. d) Directed radially towards the point charge 7) The magnitude of electric field intensity E is such that, an electron placed in it would experience an electrical force equal to its weight. This electric force is a) mge b) mg/e c) e/mg d) e²g/m² 8) Two small spheres each carrying a charge q is placed r meter apart. If one of the spheres is taken around the other one in a circular path of radius r, the work done will be equal to a) Force between them × r b) Force between them × 2πr c) Force between them/2πr d) Zero 9) What does q1 +q2 =0 signify in electrostatics? a) Additive property of charges b) Electric charges are dissimilar c) Force of attraction between them is attractive  d) Only (a) and (b) e) All (a), (b), (c) f) Only (b) and (c) 10) An infinite line charge produces a field of 9 x 10^4 NC-1 at a distance of 0.02 m. The linear charge density is a) 10^-7 Cm-1 b) 10^-7 Cm c) 10^-5 Cm-1 d) 10^-5 Cm 11) The electric field intensity between two thin infinite plane sheet carrying equal and opposite charge densities is a) surface charge density /ε0 b) surface charge density /2ε0 c) 2 x surface charge density /ε0 d) (surface charge density)2 /ε0 12) An infinite line charge produces a field of 9 × 10^4 N/C at a distance of 2 cm. Calculate the linear charge density. a) 10 x 10 -6 C/m b) 10.5 x 10 6 C/m c) 10 x 10 -3 C/m d) 5 x 10 -5 C/m 13) Figure shown below is the distribution of charges. What will be the flux of electric field due to these charges through the surface S? a) q/ε0 b) 0 c) 2q/ε0 d) q/2ε0 14) Consider a uniform electric field E = 3 × 10^3 î N/C. (a) What is the flux of this field through a square of 10 cm on a side whose plane is parallel to the yz plane? (b) What is the flux through the same square if the normal to its plane makes a 60° angle with the x-axis? a) 20Nm2/C, 5Nm2/C b) 30Nm2/C, 15Nm2/C c) 30Nm2/C, 5Nm2/C d) 15Nm2/C, 3Nm2/C 15) An electric charge q is placed at the center of a cube of side a. The electric flux on one of its faces will be a) q/6ε0 b) q/6a2 c) q/ε0 d) 2q/ε0

ELECTROSTATICS - TEST

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