Charge is distributed uniformly along an infinite straight line with constant density Pe. Develop the expression for E at the general point P. Cylindrical coordinates will be used, with the line charge as the z axis (see Fig. 2-14). At P, dQ (ra,-za, 4xE,R² \ VF+z° dE= IRI dQ = P, dz 3P Since for every dQ at z there is another charge dQ at -z, the z components cancel. Then Per dz E = 4TE,(r² + 2?) Pe Per 4xE, L,?Vr + z²

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Rigid Body

A rigid body is an object which does not change its shape or undergo any significant deformation due to an external force or movement. Mathematically speaking, the distance between any two points inside the body doesn't change in any situation.

Rigid Body Dynamics

Rigid bodies are defined as inelastic shapes with negligible deformation, giving them an unchanging center of mass. It is also generally assumed that the mass of a rigid body is uniformly distributed. This property of rigid bodies comes in handy when we deal with concepts like momentum, angular momentum, force and torque. The study of these properties – viz., force, torque, momentum, and angular momentum – of a rigid body, is collectively known as rigid body dynamics (RBD).