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Electrostate

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Q.

A hollow metal sphere of radius 5cm is charged such that potential at its surface is 10 V. the potential at the center of the sphere is

Q.

Two identical positive charges are fixed on the y-axis at equal distance the origin O. A negatively charged particle starts on thex-axis, at a large distance from O, moves along the x-axis, passes through O and moves far away from O. Its acceleration a is taken as positive along its direction of motion. The best graph between the particle’s acceleration and its x-coordinate is represented by

Q.

Three charged 1 μC, 1 μC and 2 μC are kept at vertices of A, Band C of an equilateral triangle ABC of 10 cm side respectively. The resultant force on the charge at C is

Q.

The figure shows four situations in which charges as indicated (q> 0) are fixed on an axis. In which situation is there a point to the left of the charges where an electron would be in equilibrium?

                                                                   

Q. Is electrostate important for JEE?

Yes its one of the most important topics for JEE Mains (Physics) as every year there are 2-3 questions asked from this topic. And hence its important to have a strong base in this topic to stand through the competition.

Q. Can I study Electrostatic for JEE by myself?

Yes you can study by yourself for Electrostatics through reading NCERT for basic level, solving more and more questions related to the topic, using tests series provided by us or by your school and lastly some previous year questions.

Q. For which exam in JEE electrostatic is more important?

Electrostatics is one of the most important chapter for both Mains and Advance examination.

Q. What is the weightage of marks of Electrostatics in JEE?

The weightage of marks is around 12 and the number of questions in the paper could be 3.

Q. Which topics from Electrostatics are important for JEE?

1. Electric Potential and Potential Energy
2. Capacitors
3. Conductors theory
4. Plate theory
For Advance you must go through electric field due to different shapes like infinite charged wire, wire arc,infinte sheet conducting/ non- conducting, non conducting charged sphere with its cavity etc.

Q. WHY THE ELECTROPOTENTIAL OF EARTH IS ZERO?

Earth is electrically neutral because it has the same numbers of electron and protons.If some small charge is given to earth ,its potential is not affected i.e earth is good conductor with large size.

Q. Static coulomb is is which unit i.e si unit,mks unit etc?

The statcoulomb is the physical unit for electrical charge used in the esu-cgs (electrostatic unit of charge-centimetre-gram-second system of units) and Gaussian units.

Q. if soap bubble is given negative charge then will it shrink?? if not then why?

If soap bubble is given a -ve charge its means its radius increses.This happen due to the repulsion between the negative charge i .e over the surface of the bubble. It is not shrink.

Q. in relation Er=E/Eo, where Er is relative permitivity of medium and Eo is permitivity of space . so here what E represent . may i know elaborate explanation about this expression as I am very confused about it Relation between absolute and relative permittivity?

• Absolute permittivity: Absolute permittivity is well-defined as the measure of permittivity in a vacuum and it is how much resistance is faced when forming an electric field in a vacuum. The absolute permittivity is normally symbolized by ε0. The permittivity of free space - a vacuum - is equivalent to approximately 8.85 x 10-12 Farads / meter (F/m)
• Relative permittivity: Relative permittivity is well-defined as the permittivity of a given material relative to that of the permittivity of a vacuum. It is normally symbolized by: εr.
And the relationship between these two quantities is εr=εs/ε0