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Class XII Physics Electrostatics 1

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Question 1

If g_E and g_m are the accelerations due to gravity on the surfaces of the earth and the moon respectively and if Millikan’s oil drop experiment could be performed on the two surfaces, one will find the ratio

to be

Question 2

Charges are placed on the vertices of a square as shown. Let

be the electric field and V the potential at the centre. If the charges on A and B are interchanged with those on D and C respectively, then

Question 3

Four point charges are placed in a straight line with magnitude and separation as shown in the diagram. What should be the value of q₀ such that + 10μC charge is in equilibrium?

Question 4

Two small balls each having equal positive charge Q are suspended by two insulating strings at equal length L metre, from a hook fixed to a stand. The whole set-up is taken in a satellite into space where there is no gravity. Then the angle θ between two strings and tension in each string is -

Question 5

Three charge +4q, Q and q are placed in a straight line of length l such that +q & +4q are on the ends of line & Q is at the mid-point of line. What should be the value of Q in order to make the net force on q to be zero?

Question 6

Two point charges + 8q and - 2q are located at x = 0 and x = L respectively. The location of a point on the x axis at which the net electric field due to these two point charges is zero is

Question 7

A charged particle q is shot towards another charged particle Q which is fixed, with a speed v it approaches Q upto a closest distance r and then returns. If q were given a speed 2v, the closest distances of approach would be

Question 8

A charged oil drop is suspended in uniform field of $Description: D:\GradeStack Courses\JEE Mains (Sent by Ravi)\JEE Mains Full Test\AIEEE-Full-Test-3-New_files\image207.png$ so that it neither falls nor rises. The charge on the drop will be (Take the mass of the charge $Description: D:\GradeStack Courses\JEE Mains (Sent by Ravi)\JEE Mains Full Test\AIEEE-Full-Test-3-New_files\image208.png$ and $Description: D:\GradeStack Courses\JEE Mains (Sent by Ravi)\JEE Mains Full Test\AIEEE-Full-Test-3-New_files\image209.png$ )

Question 9

Two identical balls A and B having equal charges are placed at a fixed distance experience a force F. A similar uncharged ball after touching one of them is placed at the middle point between the two balls. The force experienced by this ball is

Question 10

Four charges are arranged at the corners of a square ABCD, as shown. The force on a +ve charge kept at the centre of the square is -

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