Three isolated equal charges are placed at the three corners of an equilateral triangle as shown in the figure. The statement which is true for net electric potential V and net electric field intensity E at the centre of the triangle is:
1.
2.
3.
4.
The potential at a point 0.1 m from an isolated point charge is +100 volt. The nature of the point charge is:
1. Positive
2. Negative
3. Zero
4. Either positive or zero
A charge of 10C is placed at the origin of the x-y coordinate system. The potential difference between two points (0, a) and (a, 0) in volt will be:
1.
2.
3.
4. Zero
Four charges of the same magnitude q are placed at four corners of a square of side a. The value of the electric potential at the centre of the square will be: (Where )
1.
2.
3.
4.
Two identical positive charges are placed on the y-axis at y=-a and y=+a. The variation of V (the electric potential) along the x-axis is shown by the graph:
1.
2.
3.
4.
Which graph best represents the variation of electric potential as a function of distance from the centre of a uniformly charged solid sphere of radius R?
1.
2.
3.
4.
When a test charge is brought in from infinity along the perpendicular bisector of an electric dipole, the work done is:
1. Positive
2. Zero
3. Negative
4. None of these
The electric potential at a distance of 3 m on the axis of a short dipole of dipole moment coulomb-metre is:
1.
2. 4 mV
3. 12 mV
4. 27 mV
The electric potential in volts due to an electric dipole moment of coulomb-metre at a distance of 3m on a line making an angle of with the axis of the dipole is:
1. Zero
2. 10 V
3. 20 V
4. 40 V
An electric dipole of length 2 cm is placed with its axis making an angle of to a uniform electric field . If it experiences a torque of , then the potential energy of the dipole:
1. -10 J
2. -20 J
3. -30 J
4. -40 J