Advertisements
Advertisements
प्रश्न
- Assertion (A): Work done in moving a charge around a closed path, in an electric field is always zero.
- Reason (R): Electrostatic force is a conservative force.
विकल्प
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
Both Assertion (A) and Reason (R) are true and Reason (R) is NOT the correct explanation of Assertion (A).
Assertion (A) is true and Reason (R) is false.
Assertion (A) is false and Reason (R) is also false.
Advertisements
उत्तर
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
Explanation:
Because the electrostatic force is a conservative force, there is never any work involved in relocating a charge along a closed path in an electric field. A force that conserves mechanical energy is referred to as conservative. The electrostatic force is a force that simply depends on the position of the charges, not their velocity. Therefore, the electrostatic force's effort in transporting a charge along a closed path depends only on the charge's initial and final positions and is independent of the path travelled.
APPEARS IN
संबंधित प्रश्न
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.
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 ______.
Consider a uniform electric field in the z-direction. The potential is a constant ______.
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)?
- In a quark model of elementary particles, a neutron is made of one up quarks [charge (2/3) e] and two down quarks [charges –(1/3) e]. Assume that they have a triangle configuration with side length of the order of 10–15 m. Calculate electrostatic potential energy of neutron and compare it with its mass 939 MeV.
- Repeat above exercise for a proton which is made of two up and one down quark.
The electrostatic potential energy of a charge configuration is well-defined because the electrostatic force is a conservative force, which means:
The total electrostatic potential energy of a three-charge system is:
For a system of n charges, the total number of unique charge pairs whose potential energies must be summed is:
Four charges +q, -q, +q, -q are arranged alternately at corners A, B, C, D of a square of side d. With +q already at A, the work done in bringing -q from infinity to corner B is:
