Force on Moving Charges & Right Hand Rule Video Lessons

Concept

# Problem: An electron traveling toward the north with speed 4.0x105 m/s enters a region where the Earth’s magnetic field has the magnitude 5x10-5 T and is directed downward at 45° below horizontal. What is the magnitude of the force that the Earth’s magnetic field exerts on the electron? (e=1.60x10-19 C)A) 2.3x10-20 NB) 2.3x10-19 NC) 3.2x10-19 ND) 2.3x10-18 NE) 3.2x10-18 N

###### FREE Expert Solution

Magnetic force on moving charge:

$\overline{){\mathbf{F}}{\mathbf{=}}{\mathbf{q}}{\mathbf{v}}{\mathbf{B}}{\mathbf{s}}{\mathbf{i}}{\mathbf{n}}{\mathbf{\theta }}}$

87% (266 ratings)
###### Problem Details

An electron traveling toward the north with speed 4.0x105 m/s enters a region where the Earth’s magnetic field has the magnitude 5x10-5 T and is directed downward at 45° below horizontal. What is the magnitude of the force that the Earth’s magnetic field exerts on the electron? (e=1.60x10-19 C)
A) 2.3x10-20 N
B) 2.3x10-19 N
C) 3.2x10-19 N
D) 2.3x10-18 N
E) 3.2x10-18 N