Electric Field and Potential + Capacitor

Question 1

Define electric potential at a point

Answer 1

work done in bringing unit positive charge from infinity to that point

Question 2

Define capacitance

Answer 2

charge/ potential (difference)

Question 3

Function of capacitors in simple circuits

Answer 3

-separate charges
-store energy/ charges
-smoothing circuits
-to prevent sparks
-to block d.c.
-time delay (circuits)
-in oscillator (circuits)
-in tuning (circuits)

Question 4

Similarity of the fields of force produced by an isolated point charge and by an isolated point mass

Answer 4

both are radial
or
both have inverse square (variations)

Question 5

Difference of the fields of force produced by an isolated point charge and by an isolated point mass

Answer 5

direction is only towards the mass
or
direction can be towards or away from charge

Question 6

Define electric field strength

Answer 6

Force per unit charge E=F/q