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JEE PHYSICS MCQ: ELECTRIC FIELDS AND CHARGES
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Understanding
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For a closed surface through which the net flux is zero, each of the following four statements could be true. Which of the statements must be true ? a) There are no charges inside the surface b) The net charge inside the surface is zero c) The electric field is zero everywhere on the surface d) The number of electric field lines entering the surface equals the number leaving the surface
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Correct option: B
b, d
Option B (b, d) is correct because zero net flux implies zero net charge inside and equal number of field lines entering and leaving.
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Reason:- At any point, there is only one direction of electric field. Statement-I: A positive point charge is brought in an electric field, the electric field at neary by point will increase
Statement-II: Electric field produced by charge may favour the existing electric filed Two particles having equal mass and charge
are separated by a distance The force(s) they
experience is (are) Statement-I: No 2 electric lines of force can intersect each other
Statement-II: tangent at any point of electric line of force gives the direction of electric field A force of is acting between two charges in air if the space between them is completely filled with glass , then the new force will be …… An electron is placed at centre of a conducting sphere of radius 0.2 metre having charge coulomb. The force of on the electron is ________ N