A particle moves across the page from right to left in the presence of a uniform

Question

A particle moves across the page from right to left in the presence of a uniform electric field directed toward the top of the page. Determine the type of charge and the direction of a uniform magnetic field that could result in a zero net force on the moving charge.

A.) A positive charge and a magnetic field from left to right
B.) A negative charge and a magnetic field out of the page
C.) A positive charge and a magnetic field out of the page
D.) A positive charge and a magnetic field from top to bottom.
E.) A negative charge and a magnetic field into the page

Explanation / Answer

if the charge is negative then the electric force will be downwards so the magnetic force should be into the page for upward magnetic force so the net force on the charge is zero. So option E is the best suited.

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