Magnetic Fields

Question 1

When a charge is moving parallel to a magnetic field there is…

Answer 1

no effect on the charge

Question 2

Finding field lines inside the wire use the right hand rule with the tumb…

Answer 2

Curving in the direction of current in the wire

Question 3

Using the right hand rule to determine current (for loops of wire) only works…

Answer 3

Inside the loop

Question 4

For charges particles moving in circular motion in a magnetic field the angular velocity/ the time period is independent of…

Answer 4

the radius

Question 5

What is the period equal to for motion of a charged particle (circular motion)?

Answer 5

T = 2 pi m / b q

Question 6

How do mass spectrometers work?

Answer 6

Centripetal force = Force due to magnetic field
Assuming v and q are the same for each ion then r is proportional to m

Question 7

For flux equals BA cos theta what is theta?

Answer 7

Angle between the magnetic field and the normal to the surface of the loop

Question 8

How do you determine the direction of current with a magnetic being pushed into a coil?

Answer 8

Right hand rule.
The induced field (the thumb) acts in the opposite direction to the magnet, hence curl the fingers to determine where the direction of induced emf/ charge is

Question 9

What is assumed to change with time for an alternating current generator?

Answer 9

Only theta ( BA remains constant)