Unit 4: magnetic fields

Question 1

How does one find magnetic field around a wire carrying a current

Answer 1

Use right hand grip rule
where thumb points in the direction of the current
Other fingers point in the direction of the field

Question 2

How can one find the direction of a force in a magnetic field experience by a wire

Answer 2

Flemings left hand rule
where thumb = force direction
index = magnetic field direction
middle = current direction

Question 3

What is the equation for a magnetic force in a current carrying wire

Answer 3

F = BIL

where B = magnetic field strength, I = Current, L = length of the wire

Question 4

A moving charge is the same as a..

Answer 4

A current