Electric Charges & Fields | Quiz-02 All the best! 1. Assertion- Electric lines of force cross each other.Reason- Electric field at a point superimposes to give one resultant electric field. Both Assertion and Reason are correct and Reason is the correct explanation of Assertion Both Assertion and Reason are correct but Reason is NOT the correct explanation of Assertion Assertion is false and Reason is true Assertion is false and Reason is also false None 2. An electric dipole is in unstable equilibrium in a uniform electric field. The angle between its electric dipole moment and electric field is- 0° 90° 180° 120° None 3. Some point charges are enclosed by four closed surfaces S1, S2, S3 and S4 as shown in the figures. The ratio of areas of these surfaces are 1:2:3:4. The electric flux through the surface S1 is maximum and S4 is minimum S2 is maximum S4 is maximum is the same for all the figures None 4. A charge Q is placed at the center of a cube. The electric flux through one of its faces is- Q/εo Q/6εo Q/8εo Q/3εo None 5. Two similar spheres having +Q and -Q charges are kept at a certain distance. The force F acts between the two charges. If at the middle of two spheres, another similar sphere having +Q charge is kept, then it experiences a force in magnitude and direction as- 4F towards -Q charge 4F towards +Q charge 8F towards -Q charge 8F towards +Q charge None 6. Assertion- Work done in moving a charge around a closed path in an electric field is always zero.Reason- Electrostatic force is a conservative force. Both Assertion and Reason are correct and Reason is the correct explanation of Assertion Both Assertion and Reason are correct but Reason is NOT the correct explanation of Assertion Assertion is true and Reason is false Assertion is false and Reason is also false None 7. The magnitude of the electric field due to a point charge object at a distance of 4 m is 9 N/C. From the same charged object, the electric field of magnitude 16 N/C will be at a distance of- 1 m 2 m 3 m 6 m None 8. A point P lies at a distance x from the midpoint of an electric dipole on its axis. The electric potential at point P is proportional to- (A) x-2 (B) x-3 (C) x-4 (D) x-1/2 Option (A) Option (B) Option (C) Option (D) None 9. An electric dipole of dipole moment 2 x 10-8 C m in a uniform electric field experiences a maximum torque of 6 x 10-4 Nm. The magnitude of electric field is- (A) 2.2 x 103 Vm-1 (B) 1.2 x 104 Vm-1 (C) 3 x 104 Vm-1 (D) 4.2 x 103 Vm-1 Option (A) Option (B) Option (C) Option (D) None 10. A point charge q is kept at a distance r from an infinitely long straight wire with charge density λ. The magnitude of the electrostatic force experienced by charge q is- Zero qλ/2πrεo qλ/4πrεo qλ/rεo None 1 out of 10 Time's up
