ONE AND TWO MARKS QUESTION
1) What is meant by electric potential at point ?
2) Does the work done in moving a charge in an electric field depend on the fo
3) Define electric potential difference between two points
4) Explain the situation where electric potential is zero
S) Can electric potential at a point be zero while electric intensity at that point
6) What is the relation between electric field intensity and potential gradient at
s the directi7) What ion of electric field w.rt equipotential surface?
8. What is an equipotential surface?
9) What is the shape of equipotential surface for a point charge?
11)Why is electric potential of earth taken to be zero?
12)Distinguish between electric potential and potential energy.
13)If two electrons are brought towards each other, then will the electric pot
system increase or decrease ?
14) What is a capacitor?
15) What do you mean by capacitance of a capacitor?
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Answers
Answer:
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Answer:
1. The electric potential tells you how much potential energy a single point charge at a given location will have. The electric potential at a point is equal to the electric potential energy (measured in joules) of any charged particle at that location divided by the charge (measured in coulombs) of the particle.
2.Hence, work done is dependent on magnitude of the charge and potential difference , but independent of the mass of the charged particle.
3.The electric potential difference between points A and B, VB−VA is defined to be the change in p nootential energy of a charge q moved from A to B, divided by the charge. ... Voltage is not the same as energy. Voltage is the energy per unit charge
4. The electric potential from a single charge is defined to be zero an infinite distance from the charge, and the electric potential associated with two charges is also defined to be zero when the charges are infinitely far apart.
5.Yes, electrostatic potential can be zero at a point where electric field is not zero. Consider two charges +Q and -Q separated by a distance d.
6. The change of electric potential with respect to distance is called potential gradient. It is denoted by dv/dx. hence, the negative of potential gradient is equal with electric field intensity
7.we can represent electric potentials (voltages) pictorially, just as we drew pictures to illustrate electric fields. This is not surprising, since the two concepts are related. Consider Figure 7.6.1 , which shows an isolated positive point charge and its electric field lines, which radiate out from a positive charge and terminate on negative charges. We use blue arrows to represent the magnitude and direction of the electric field, and we use green lines to represent places where the electric potential is constant. These are called equipotential surfaces in three dimensions, or equipotential lines in two dimensions. The term equipotential is also used as a noun, referring to an equipotential line or surface. The potential for a point charge is the same anywhere on an imaginary sphere of radius r surrounding the charge. This is true because the potential for a point charge is given by V=kq/r and thus has the same value at any point that is a given distance r from the charge. An equipotential sphere is a circle in the two-dimensional view of Figure 7.6.1 . Because the electric field lines point radially away from the charge, they are perpendicular to the equipotential lines.
8.The surface which is the locus of all points which are at the same potential is known as the equipotential surface. No work is required to move a charge from one point to another on the equipotential surface.