The coulombs force between two charges is 28N. If paraffin wax of relative permittivity 2.8 is introduced between the charges as a medium, then the force reduces to:
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Force in a dielectric medium is reduced by the relative permittivity.
The space around any charge in which its influence could be felt by another charge placed there is:
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The region around a charge where electric force can be experienced is its electric field.
One coulomb is the quantity of charge which when placed one meter from an identical charge in vacuum (or air) will repel it with a force of:
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Use Coulomb's law F = kq₁q₂/r².
If quantity of the charge on each of the two bodies is doubled, the force between them becomes:
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Coulomb force is proportional to q₁q₂.
Two charges when 10 cm apart, attracted each other with a force of (F) N. If they are placed 5cm apart, the same charges will attract each other with a force of:
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By Coulomb's law, force is inversely proportional to the square of distance.
The unit of charge in SI system is ______ while in CGS it is ______.
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The SI unit is coulomb and the CGS electrostatic unit is ESU.
The concept of electric lines was presented by:
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Michael Faraday introduced the concept of electric field lines.
It is a vector quantity:
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Electric field intensity has both magnitude and direction.
Intensity of an electric field due to a point charge:
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For a point charge, E = kQ/r².
When angle between the surface of scalar area (ΔA) and the electric field intensity is 0°, the flux through (ΔA) is:
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Using Φ = EA cosθ, at 0° the flux magnitude is EA. The source also labels this as maximum.
The minimum charge on any object cannot be less than:
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The elementary charge is approximately 1.6 × 10⁻¹⁹ C.
The force experienced by a charge 10C when placed at a point is 10N. The electric field intensity at a point is:
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Use E = F/q = 10 N / 10 C.
The potential at a point situated at a distance of 50cm from a charge of 5 μC is:
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Use V = kQ/r with Q = 5 μC and r = 0.5 m.
In SI unit electric field intensity is measured in:
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The SI unit of electric field is newton per coulomb.
Electric flux through a surface depends upon:
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Φ = EA cosθ, so flux depends on field, area and orientation.
Electric field intensity E at any point due to the source charge (Q) is defined as:
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Electric field intensity is force per unit positive test charge.
The SI unit of electric flux is:
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Electric flux has SI unit N m²/C.
An electric charge at rest produces:
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A stationary charge produces an electric field but no magnetic field due to its motion.
How many electrons are there in one coulomb charge:
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Number of electrons = 1 C divided by the charge of one electron.
At an infinite distance from the electric charge, the electric intensity will be:
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For a point charge, electric field tends to zero as distance approaches infinity.
