Question

All the free charges are the integral multiples of a basic unit charge ‘e’. Calculate the number of

electrons in 1 C of charge. (1)

2. Match the following.

A B

a) Force a) Coulomb (C)

b) Charge b) N/C

c) Electric field c) Coulomb metre (Cm)

d) Dipole moment d) Newton (N) (2)

3. Two equal and opposite charges +q and -q are separated by a small distance ‘2a’.

a)Name this arrangement.

b)Define its moment. Give the direction of the moment. (2)

4. a) Draw the electric field lines surrounding the charge if

i) +q and -q separated by a distance ‘r’ in air.

ii) Two +q charges separated by a distance ‘r’ in air.

b) Two electric field lines never intersect each other. Why? (3)

5. Electric field is the space around a charge where its force is experienced.

a) In defining electric field intensity, the test charge must be very very small. Why?

b) Two point charges 20 µC and 80 µC are placed 18 cm apart in air. Find the position at

which electric field is zero. (3)

6. a) State Coulomb’s law.

b) Two point charges +16 µC and -9 µC are placed 8 cm apart in air. Calculate the force between

the two charges.

c) If air between two charges is replaced by water, what change in force will you expect.

Why? (4)​

Answer 1

Answer:

a. newton.

b. coulomb.

c. coulomb meter.

d. N/C.

4,(b) two electric field lines do not intersect each other due to repulsion of positive and negative charges.

6,(c) . If air is replaced by water then the attraction between positive charge increased and electrons move in high speed.

sorry, l know answers of only these questions..

Hope these helps you.