A charged particle, passing through a certain region of space, has a velocity wh

Question

A charged particle, passing through a certain region of space, has a velocity whose magnitude and direction remain constant.
(a) If it is known that the external magnetic field is zero everywhere in this region, can you conclude that the external electric field is also zero?
yes
no
not enough information to decide

Explain


(b) If it is known that the external electric field is zero everywhere, can you conclude that the external magnetic field is also zero?
yes
no
not enough information to decide

Explain

Explanation / Answer

a) No! If the magnetic field is 0, we can only conclude that there is no 'changing' electric field. It could be constant! b)No! If the electric field is 0, we can only conclude that there is no 'changing' magnetic field. It could be constant!

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