Question

A positive charge is moving from the floor of a room toward the ceiling. A magnetic field runs from east to west. In what direction is the magnetic force on the moving positive charge?
A. toward the north
B. toward the south
C. toward the east
D. toward the west
E. toward the floor

Answer 1

B

Answer 2

What is the difference between the fields surrounding a stationary charge and those that surround a moving charge?

Answer 3

in case of stationary charge only electric field exists while if the charge is moving we get magnetic field along with electric field

Answer 4

One beam of electrons moves at right angles to a magnetic field. The force on these electrons is 4.9 × 10-14 newtons. A second beam travels at the same speed, but at a 30° angle with the magnetic field. What force is on these electrons?

Answer 5

force is given by the lorentz eqn, F= Bqv(sinA) where A is the angle between v and B
When the beam moves at rt angles
Bqv(sin90)=4.9*10^14
When the beam moves at 30 degrees
Bqv(sin30)=F

we can easily find the value of F