Advertisements
Advertisements
प्रश्न
A point charge Q is placed at point 'O' as shown in the figure. Is the potential at point A, i.e. VA, greater, smaller or equal to potential, VB, at point B, when Q is (i) positive, and (ii) negative charge?
उत्तर
A positive charge creates a positive potential around it in space while a negative charge creates a negative potential around it.
As we move away from the charge radially, the potential decreases. For positive charge the positive potential decreases and for negative charge negative potential decreases.
(i) If the charge is positive then the potential at point A is more positive than the potential at point B. For example, it can be 6 V at A and 3 V at B. So, if you find the potential difference, it will be 3 V.
VA > VB
(ii) If the charge is negative then the potential at point A is more negative than the potential at point B. For example, it can be -6 V at A and -3 V at B. So, if you find the potential difference, it will be [-6-(-3)]=-3 V
VA < VB
APPEARS IN
संबंधित प्रश्न
A cube of side b has a charge q at each of its vertices. Determine the potential and electric field due to this charge array at the centre of the cube.
Four point charges Q, q, Q and q are placed at the corners of a square of side 'a' as shown in the figure.
Find the
1) resultant electric force on a charge Q, and
2) potential energy of this system.
A point charge Q is placed at point O as shown in the figure. The potential difference VA – VB positive. Is the charge Q negative or positive?
Figure shows the field lines due to a positive point charge. Give the sign of potential energy difference of a small negative charge between the points Q and P.
1 volt is equivalent to ______.
The work done in bringing a unit positive charge from infinite distance to a point at distance x from a positive charge Q is W. Then the potential at that point is ______.
Consider a uniform electric field in the z-direction. The potential is a constant ______.
- Assertion (A): An electron has a high potential energy when it is at a location associated with a more negative value of potential, and a low potential energy when at a location associated with a more positive potential.
- Reason (R): Electrons move from a region of higher potential to region of lower potential.
Select the most appropriate answer from the options given below:
Calculate potential energy of a point charge – q placed along the axis due to a charge +Q uniformly distributed along a ring of radius R. Sketch P.E. as a function of axial distance z from the centre of the ring. Looking at graph, can you see what would happen if – q is displaced slightly from the centre of the ring (along the axis)?
Justify your answers for each case.
State the significance of the negative value of electrostatic potential energy of a system of charges.
Three charges are placed at the corners of an equilateral triangle ABC of side 2.0 m as shown in the figure. Calculate the electric potential energy of the system of three charges.
