Electric Charges and Fields NCERT PICKS There is a | IIT JEE NEET BOOKS
Electric Charges and Fields
NCERT PICKS
There is a spark or crackle when we take off oursynthetic clothes or sweater in dry whether.
It is observed that if two glass rods rubbed with wool or silk cloth are brought close to each other, they repel each other.
On rubbing two body, the mass of one body slightly get lowered.
An ebonite rod held in hand can be charged by rubbing with funnel but a copper rod cannot be charged like this.
When we touch a pith ball with an electrified plastic rod, some of the negative charges on rod are transferred.
While calculating the force between the two charges from coulomb's law, never take into account, the sign of two charges. It just indicates nature of the force.
The test charge used to measure electric field at point is taken as unit in magnitude or very small.
Field lines are always directed from higher potential to lower potential.
Neutral point is a point where resultant electric field is zero.
When a charged particle enters with velocity at right angle to the uniform field the trajectory is parabola.
A surface having same electric potential at every point is an equipotential surface.
Work done in moving a charge along an equipotential surface is always zero.
Relative permitivity of the material is also known as specific inductive capacitance.
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