Charged Particles

Question 1

What angle is the force due to a magnetic field?

Answer 1

Always 90 to the velocity.

Question 2

Equation of magnetic force on a moving particle at right angles to a magnetic field.

Answer 2

F = BQv (If the particle is moving at an angle F= BQvsin0)

Question 3

Equation for centripetal force produced by magnetic force.

Answer 3

Bev = mv²/r

Question 4

Equation of velocity when the electric and magnetic field forces are equal.

Answer 4

Since Ee = Bev
And E = V/d
Therefore, v = V/Bd

Question 5

Equation to calc. charge to mass ratio. (Based on magnetic force being the centripetal force).

Answer 5

Q/m = v/Br

OR

Q/m = 2V/r²B²

Question 6

Equation of velocity when the electric and magnetic field forces are equal.

Answer 6

Since Ee = Bev
And E = V/d
Therefore, v = V/Bd

Question 7

Hall voltage increases as…..?

Answer 7

Magnetic flux density increases.

Question 8

Equation for Hall voltage.

Answer 8

V = BI/ nte

OR

V = BId/ nAe

Question 9

For a hall probe, why is a semiconductor used instead of a metal.

Answer 9

Cuz electrons in a semiconductor move faster than the electrons in a metal for a given current, so the effect is much greater. (Using equation I = nAve) (in S.C there are less electrons so they move faster.).