SSC – NCERT NOTES OF PHYSICS(IMPORTANT POINTS)


Dielectrics
The non conducting material in which equal and opposite induce charges
are produce on their opposite face on the application of electric
field are called as dielectrics.
Ex.air,glass ,mica

Dielectric constant (k)
The ratio of the applied electric field to the reduce value of
electric field on placing the dielectric between the two oppositivly
charge plate is called dielectric constant.

Capacitor
A capacitor consist of two conducting bodies separated by a non
conducting medium such that it can store large amount of electric
charge.

Define one ampere?
Ans. A current is said to be one ampere if one coulomb of charge flow
through a cross sectional of any conductor in one second.

Drift velocity
Ans. drift velocity is defined as the average velocity with which free
electron in a conductor get drifted in a direction opposite to the
direction of applied electric field.

Relaxation time
The small interval of time between two success collision between
electron and ions in the conductor is called relaxation of time.

Mobility
It is defined as the ratio of drift velocity to the applied electric field.

Current density
Current per unit area is called current density.

Leave a Reply