A point charge is brought in an electric field. The electric field at a nearby point,

(a)	will increase if the charge is positive
(b)	will decrease if the charge is negative
(c)	may increase if the charge is positive
(d)	may decrease if the charge is negative

Choose the correct option:

1.	(a) only	2.	(b), (c)
3.	(c), (d)	4.	(a), (d)

An electric dipole is placed in an electric field generated by a point charge.

A proton and an electron are placed in a uniform electric field.

Choose the correct option.

A charge Q is uniformly distributed over a large plastic plate. The electric field at a point P close to the centre of the plate is 10 V/m^–1. If the plastic plate is replaced by a copper plate of the same geometrical dimensions and carrying the same charge Q, the electric field at the point P will become

1.   zero

2.   5 V m^–1 

3.   10 V m^–1

4  20 V m^–1

A metallic particle having no net charge is placed near a finite metal plate carrying a positive charge. The electric force on the particle will be

1.  towards the plate

2.  away from the plate

3.  parallel to the plate

4.  zero.

Electric charges are distributed in a small volume. The flux of the electric field through a spherical surface of radius \(10~\mathrm{cm}\) surrounding the total charge is \(25\) V-m. The flux over a concentric sphere of radius \(20\) cm will be:
1. \(25\) V-m
2. \(50\) V-m
3. \(100\) V-m
4. \(200\) V-m

The figure(a) shows an imaginary cube of edge \(L/2\). A uniformly charged rod of length \(L\) moves towards left at a small but constant speed \(u\). At \(t=0\), the left end just touches the centre of the face of the cube opposite it. Which of the graphs shown in figure(b) represents the flux of the electric field through the cube as the rod goes through it?

     
1. a
2. b
3. c
4. d

Given below are four statements:

Choose the correct option:

A positive point charge \(Q\) is brought near an isolated metal cube.

Choose the correct option from the given ones: