PhysicsAdvancedHigh School (11–12)Electricity & Magnetism › ElectrostaticsNEETAEEE (Amrita)AMUEEEAP EAPCETBCECECMI Entrance
Created by StemPy LabTwo statements about electric field lines are given below. Statement I: In electrostatics, field lines start on positive charges and end on negative charges, and no field line can form a closed loop. Statement II: A positive point charge released from rest where the field lines are curved moves along the field line through its starting point.
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← Three identical small metal spheres A, B and C stand on insulating stands. A carries +12 nC, B carries -4.0 nC and C is neutral. A and B are fixed 6.0 cm apart. C is first touched to A, then touched to B, and then taken far away. Take 1/4πε₀ = 9.0 × 10⁹ N m²C⁻² and treat the spheres as point charges. What is the force between A and B now?Assertion (A): A closed surface surrounds some charges. When a charge outside the surface is moved to another place outside it, the net flux through the surface does not change, although the field at points of the surface does change.
Reason (R): The net flux through a closed surface depends only on the charge enclosed by it, while the field at any point is produced by all charges, inside and outside. →
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