Physics · JEE

Electric charges: conservation of charge, Coulomb's law forces between two point charges, forces between multiple charges, superposition principle and continuous charge distribution Mock Test for JEE

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Q1PhysicsUnit 11: Electrostatics

was the first to discover that lightning is electric discharge.

Q2PhysicsUnit 11: Electrostatics

What is the net charge on an neutral atom?

Q3PhysicsUnit 11: Electrostatics

There are two charges

+2 \mu C

and

-

3 \mu C .

The ratio of forces acting on them will be

Q4PhysicsUnit 11: Electrostatics

Positive point charges are placed at the vertices of a star shape as shown in the figure. Direction of the electrostatic force on a negative point charge at the centre

\boldsymbol{O}

of the star is:

Q5PhysicsUnit 11: Electrostatics

The important conclusion given by Millikan's experiment about the charge is

Q6PhysicsUnit 11: Electrostatics

Two equal charges

q

are kept fixed at

a

and

+a

along the

x

-axis. A particle of mass

m

and charge

\frac{q}{2}

is brought to the origin and given a small displacement along the

x

-axis, then:

Q7PhysicsUnit 11: Electrostatics

When air is replaced by a dielectric medium of force constant

\mathrm{K}

, the maximum force of attraction between two charges, separated by a distance :

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