Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
The electric field intensity at a point is defined as:
Force per unit charge
Charge per unit force
Work per unit charge
Force per unit area
Force per unit charge
Electric field intensity at a point is defined as the force experienced by a unit positive test charge placed at that point. It describes the strength and direction of the electric influence exerted by source charges in the surrounding space.
Electric field intensity at a point is defined as the force experienced by a unit positive test charge placed at that point. It describes the strength and direction of the electric influence exerted by source charges in the surrounding space.
Think of the electric field like the 'wind strength' around a fan; it tells you how much force you would feel if you placed an object at that specific spot, regardless of whether you actually place the object there.
E = F/Q (Electric field is Force divided by Quantity of charge).
E=q0тАЛFтАЛ тАФ Definition of electric field intensity
E=4╧А╧╡0тАЛ1тАЛтЛЕr2QтАЛr^ тАФ Electric field due to a point charge Q
According to Coulomb's Law, a source charge Q exerts an electrostatic force F on a test charge q0тАЛ. The electric field E is defined as the limit of the ratio of the force to the test charge as the test charge approaches zero to avoid disturbing the original field distribution. This ensures the field is a property of the source charge's location, not the probe.
The SI unit of electric field intensity is Newtons per Coulomb (N/C) or Volts per meter (V/m).
Electric field is a vector quantity, meaning it has both magnitude and direction.
The direction of the electric field is the same as the direction of the force acting on a positive test charge.
Electric field lines originate from positive charges and terminate on negative charges.
Allows for the calculation of force on any charge without knowing the entire distribution of source charges.
Requires infinitesimal test charges to maintain accuracy in non-uniform fields.
Determining the trajectory of charged particles in a cathode ray tube.
Calculating potential differences in capacitors and semiconductors.
The value ╧╡0тАЛ is the permittivity of free space, approximately 8.854├Ч10тИТ12┬аF/m.
Option B is incorrect because charge per unit force is not a standard physical constant. Option C defines potential difference per unit distance, while Option D refers to electric flux density in specific contexts.
A is correct тАФ Electric field intensity is defined as the force per unit positive test charge placed at that point.
Remember that Electric Potential (V) is defined as Work per unit charge (W/q), whereas Electric Field (E) is Force per unit charge (F/q); always distinguish between vector (field) and scalar (potential) quantities.