# Energy Momentum Formula

Consider a particle or macroscopic body having mass m0 having momentum of magnitude p and total energy E, the Energy-momentum formula is given by

$E=\sqrt{(p^{2}c^{2})+ (m_{0}c^{2})^{2}}$

Where:

E = Energy

p= momentum

C = speed of light

m0 = rest mass

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Potential at the centroid of an equilateral triangle of side ‘a’,  when equal charges each of magnitude ‘Q’ are placed at the vertices of the triangle is?