A particle of charge q and mass m moving up the page with velocity v enters a re

Question

A particle of charge q and mass m moving up the page with velocity v enters a region with a uniform electric field E pointing to the right AND a uniform magnetic field B directed into the page.

A) write (symbolically) the force FE on the charge due to the electric field.

B) In what direction does FE point for positive q?

C) Write (symbolically) the force FB on the charge due to the magnetic field.

D) In what direction does FB point for positive q?

E) Determine (symbolically) the velocity v for which these two forces balance and the charge experiences zero net force (ignore gravity)

I would appreciate help with any of this!! I get so confused about the field directions!!

Explanation / Answer

A) FE = E*q ........towards right

B) towards right

C) Fb = q*V*B

D) left

E) FE = FB

E*q = q*V*B

v = E/B

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