Q. 44.5( 4 Votes )
Two equal positive charges are kept at points A and B. The electric potential at the points between A and B (excluding these points) is studied while moving from A to B. The potential
A. continuously increases
B. continuously decreases
C. increases then decreases
D. decrease then increases
Potential due to a point charge at a distance r is given by:
Therefore, at a point very nearby to A and B, r → 0 ∴ V → ∞
At a very nearby point right to A and a very nearby point left to B, potential will tend to ∞ (maximum possible value) as separation will tend to zero. That means at a point somewhere in the middle of path AB, the potential will acquire its minimum value.
Therefore, while moving from A to B, potential will first decrease and then increase.
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(a) 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.
(b) Repeat above exercise for a proton which is made of two up and one down quark.
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