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NEET Physics Notes Electrostatics-Electric Field

NEET Physics Notes Electrostatics-Electric Field

Electric Field

Electric Field

The space surrounding an electric charge q in which another charge q0 experiences a force of attraction or repulsion, is called the electric field of charge q. The charge q is called the source charge and the charge q0 is called the test charge. The test charge must be negligibly small, so that it does not modify the electric field of the source charge.
Electric field vector E (also known as the electric field intensity) at any point, is given by
NEET Physics Notes Electrostatics-Electric Field 1
where, q0 is a small positive test charge which experiences a force F at a given point.
SI unit of electric field is NC-1 and it is also known as Vm”1. The dimensional formula for electric field is [MLT^A-1].

Electric Field Lines

An electric field line in an electric field is a smooth curve, tangent to which, at any point, gives the direction of the electric field at that point.

Motion of a Charged Particle in an Electric Field

A charged particle is released from rest in an electric field E.
Then, force on charged particle is given by
F=qE
The acceleration produced by this force is given
NEET Physics Notes Electrostatics-Electric Field 2
Since, E is constant, the acceleration a is also constant. Hence, the particle is uniformly accelerated. Let the particle starts from rest, then given by v = u + at
NEET Physics Notes Electrostatics-Electric Field 3
The distance travelled by the particle is given by
NEET Physics Notes Electrostatics-Electric Field 4

The kinetic energy gained by the particle
NEET Physics Notes Electrostatics-Electric Field 5

A charged particle enters the field in perpendicular direction.
Let a charged particle of mass m and charge charge q, enters the electric field along X-axis with speed u. The electric field E is along Y-axis is given by Fy = qE
and force along X-axis remains zero, i.e. Fx = 0
NEET Physics Notes Electrostatics-Electric Field 6
Acceleration of the particle along Y-axis is given by
NEET Physics Notes Electrostatics-Electric Field 7
The initial velocity is zero along Y-axis ( Uy = 0).
The deflection of charged particle along Y-axis after time t is given by
NEET Physics Notes Electrostatics-Electric Field 8
Along X-axis there is no acceleration, so the distance covered by particle in time t along X-axis is given by x = ut Eliminating t, we haveNEET Physics Notes Electrostatics-Electric Field 9
NEET Physics Notes Electrostatics-Electric Field 10
This shows that the path of charged particle in perpendicular field is a parabola.

Important properties of electric field lines are

  • Electric field lines come out of a positive charge and go into the negative charge.
  •  No two electric field lines intersect each other.
  •  Electric field lines are continuous but they never form a closed loop.
  •  Electric field lines cannot exist inside a conductor. Electric shielding is based on this property.

Electric Field due to a Point Charge

Electric Field at a Distance r from a Point Charge q is
NEET Physics Notes Electrostatics-Electric Field 11
If ql and are two like point charges, separated by a distance r, a neutral point between them is obtained at a point distant r1 from qv such that
NEET Physics Notes Electrostatics-Electric Field 12
If q1 and q2 are two charges of opposite nature separated by a distance r, a neutral point is obtained in the extended line joining them, at a distance  r1 from qv such that
NEET Physics Notes Electrostatics-Electric Field 13

Electric Field due to Infinitely Long Uniformly Charged Straight Wire

Electric field at a point situated at a normal distance r, from an infinitely long uniformly charged straight
wire having a linear charge density λis given by
NEET Physics Notes Electrostatics-Electric Field 14
Electric Field due to a Charged Cylinder

For a conducting charged cylinder of linear charge density λ and radius R, the electric field is given by
NEET Physics Notes Electrostatics-Electric Field 15
Electric Field due to a Uniformly Charged Infinite Plane Sheet

Electric field near a uniformly charged infinite plane sheet having surface charge density σ is given by
NEET Physics Notes Electrostatics-Electric Field 16

Electric Field due to a Uniformly Charged Thin Spherical Shell

For a charged conducting sphere/ shell of radius R and total charge Q, the electric field is given by
NEET Physics Notes Electrostatics-Electric Field 17

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