CBSE Class 12-science Physics Electric Charges and Fields
Charging by contact: Charge is transferred by touch.
Charging by induction and grounding: Charge is often an efficient way of charging a conductor.
Conductors: Allow the easy passage of charges.
Insulators: Resist the passage of charges.
2. Superposition principle: The net resultant force on a charge due to multiple charges is the vector sum of forces due to individual charges.
Superposition principle: The net electric field at any point due to the multiple charges is the vector sum of the electric field due to each charge at that point.
The electric field produced by a point charge Q at a point
Electric field lines going out of the surface: Positive flux.
Electric field lines going into the closed surface: Negative flux.
1. Field of an electric dipole in its equatorial plane at a distance y from the centre:
2. Dipole electric field on the axis at a distance x from the centre
Gold Leaf Electroscope
Charging due to contact: Transfer of charge from one body to another due to contact.
Gold-leaf electroscope : An apparatus to detect charge on a body.
Quantization: Electric charge is always an integral multiple of an electronic charge.
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