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# (a) Who discovered the fact that amber rubbed with wool or silk attracts light objects ?(b) Define current density.(c) What should be the angle between the velocity vector of the charged particle field to experience a maximum force, when a charged particle is moving in a field ?

Last updated date: 13th Jul 2024
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Hint: When amber is rubbed with silk or wool, amber gets positively charged and this can be explained with the help of the static electricity concept. Thales of Miletus discovered the fact that amber rubbed with wool or silk attracts light objects.

The current density of a conductor is defined as the amount of current passing per unit area of conductor. It is a vector quantity and is expressed as $J = \dfrac{I}{A}$. The S.I. the unit of current density is $A{m^{ - 2}}$. The angle between the velocity vector of the charged particle field to experience a maximum force, when a charged particle is moving in a field is ${90^ \circ }$ because $F = Bqv\sin \theta$ and the value $\sin 90$ is the maximum value applicable in this situation.
(c) The angle between the velocity vector of the charged particle field to experience a maximum force is ${90^ \circ }$.