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Electric field is considered one of the most asked concept.
62 Questions around this concept.
If a charge q is placed at the centre of the line joining two equal charges Q such that the system is in equilibrium then the value of q is
What is the magnitude of a point charge due to which the electric field 30 cm away has the magnitude 2 Newton/coulomb ?
Two point charges Q and – 3Q are placed at some distance apart. If the electric field at the location of Q is E, then at the locality of – 3Q, it is
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Electric field and electric lines of force:
The space around a charge in which another charged particle experiences a force is said to have an electric field in it.
Electric Field Intensity:
The electric field intensity at any point is defined as the force experienced by a unit positive charge placed at that point.
Electric field intensity,
where F is the force experienced by q0. The SI unit of E is,
The dimensional formula is
The electric field is a vector quantity and due to positive charge is away from the charge and for the negative charge, it is towards the charge.
Electric field due to a point charge:
Consider a point charge placed at the origin O. Let a test charge q0 is placed at P which is at a distance r from O. Force F on test charge q0 is
The electric field at point P due to q is
(As qo tends to zero the electric field produced by q is not affected by qo.)
The magnitude of the electric field
Electric field due to a system of charge:
Electric field obeys the superposition principle. That is the electric field due to a system of charge at a point is equal to the vector sum of all the electric fields.
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