JEE Physics Electric Charges and Fields MCQs Set B

Question. A charged body has an electric flux F associated with it. Now if the body is placed inside a conducting shell then the electric flux outside the shell is
(a) Equal to F
(b) Less than F
(c) Greater than F
(d) Zero

Answer: A

Question. A rectangular surface of sides 10 cm and 15 cm is placed inside a uniform electric field of 25 V/m, such that the surface makes an angle of 30° with the direction of electric field. Find the flux of the electric field through the rectangular surface
(a) 0.1875 Nm²/C
(b) 0.1675 N/m²C
(c) Zero
(d) 0.1075 Nm²/C

Answer: A

Question. The electric field in a region is radially outward and at a point is given by E = 250 r V/m (where r is the distance of the point from origin). Calculate the charge contained in a sphere of radius 20 cm centred at the origin
(a) 2.22 × 10^–10 C
(b) 2.22 × 10^–8 C
(c) 2.22 × 10^–6 C
(d) Zero

Answer: A

Question. Select the correct statement about electric charge
(a) Charge on a body is always integral multiple of a certain charge called charge of electron
(b) Charge on a body is always positive or zero
(c) Charge of a particle increases with increase in its velocity
(d) Charge can be converted into energy and energy can be converted into charge

Answer: A

Question. Which of the following is not true about electric charge?
(a) A particle having zero rest mass can have non zero charge
(b) A particle having nonzero rest mass can have zero charge
(c) Charge on an isolated system is always conserved
(d) Charge is a scalar quantity

Answer: A

Question. Two positive point charges of unequal magnitude are placed at a certain distance apart. A small positive test charge is placed at null point, then
(a) The test charge is in unstable equilibrium
(b) The test charge is in neutral equilibrium
(c) The test charge is in stable equilibrium
(d) The test charge is not in equilibrium

Answer: A

Question. Which of the following is not the unit of charge?
(a) Farad
(b) Coulomb
(c) Stat coulomb
(d) Faraday

Answer: A

Question. If two charges of 1 coulomb each are placed 1 km apart, then the force between them will be
(a) 9 × 10³ N
(b) 9 × 10^–3 N
(c) 9 × 10^–4 N
(d) 10^–6 N

Answer: A