Define electric field at a point. Give its unit and obtain an expression for the electric field at a point due to a point charge.
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Electric Field :- In a simple word, Electric field can be defined as electric force per unit charge.
At a point charge , The field direction is in the direction of force too. Electric field is partially outwards from the +ve charge and across to the -ve point charge.
The unit of the Electric Field is N/C. [Force per unit charge].
Electric field at a point is given by the Expression,
E = kQ/r²
where, Q is the Charge of the source, k is the coulomb constant, r is the distance.
Proof ⇒
Electric field intensity is the per unit charge,
E = F/q
where, F is the Force and q is the unit charge.
E = kQq/r²q
∴E = kQ/ r²
Hope it helps. :-)
At a point charge , The field direction is in the direction of force too. Electric field is partially outwards from the +ve charge and across to the -ve point charge.
The unit of the Electric Field is N/C. [Force per unit charge].
Electric field at a point is given by the Expression,
E = kQ/r²
where, Q is the Charge of the source, k is the coulomb constant, r is the distance.
Proof ⇒
Electric field intensity is the per unit charge,
E = F/q
where, F is the Force and q is the unit charge.
E = kQq/r²q
∴E = kQ/ r²
Hope it helps. :-)
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