Equations

Question 1

Kinetic Energy

Answer 1

1/2 • mv²

Question 2

Work

Answer 2

F • Δx

Joules

Question 3

Power

Answer 3

Work / time

Question 4

Momentum

Answer 4

mass • velocity

Question 5

Coulomb’s law

Answer 5

F = k•q₁•q₂ / r²

Question 6

Electric field

Answer 6

E = k•q / r²

Question 7

Magnetic field of a wire

Answer 7

μ₀ • I
B = ——-
2πr

I = current (in Volts)
μ₀ = permeability of free space

Question 8

Magnetic force (particle)

Answer 8

F = q•(v•B•sin θ)

B = magnetic field
sin θ is between the velocity and field vectors

Question 9

Magnetic force (wire)

Answer 9

F = I•(L•B•sin θ)

I = current in Volts
L= perpendicular length of the wire
B = magnetic field

Question 10

Torque

Answer 10

Force • radius

Question 11

Potential difference in a moving conductor

Answer 11

ΔV = v•B•L

B = magnetic field (in teslas)
L = length of the conductor

Question 12

Energy of light

Answer 12

E = nhf

n - number of photons
h - Planck’s constant
f - frequency

Question 13

Wave equation

Answer 13

f = v / λ

Question 14

Circular motion of a particle in a magnetic field

Answer 14

qvB = mv²/r
Or
r = mv/qB

B - perpendicular magnetic field