An electron moving at 4.40 ✕ 103 m/s in a 1.45 T magnetic field experiences a magnetic force of 1.40 ✕ 10−16 N. What angle does the velocity of the electron make with the magnetic field? There are two answers between 0° and 180°.

Explanation:

Given that,

Speed of an electron,

Magnetic field, B = 1.45 T

Magnetic force,

The magnetic force is given by in terms of charge, speed and magnetic field on which the charged particle is kept :

or

Hence, this is the required solution.              

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pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y