| Question |
Answer |
| What is the formula for the electrostatic force between 2 charges q1 and q2 separated by a distance r |
F = k(q1)(q2)/(r^2) |
| What is the formula for the force felt by a positive test charge (q) when brought into an electric field of strength E |
F = qE |
| What is the electric field (E) at a distance r away from a point charge Q? |
E = KQ/r^2 |
| What is the formula for the electric potential (V) due to a source charge Q at a distance r from the source charge? |
V = KQ/r |
| What is the formula for the potential difference (V) in measuring the work done to move a charge q against an electric field? |
V = work/q |
| What is the formula for the electric potential energy between 2 charges q1 and q2, initially at an infinite distance apart, to a separation distance of r? |
U = K(q1)(q2)/r |
| The electric field (E) between 2 plates d units apart with a voltage (V) across the plates is? |
E = V/d |
| A parallel plate capacitor has a capacitance (C), expressed in terms of area (A) and distance apart (d) of? |
C = (permittivity)*A/d |
| The electric energy (U) stored in a capacitor is? |
U = 1/2 CV^2 or (1/2)QV |
| Capacitors in parallel? |
C = C1 + C2 + ... |
| Capacitors in series? |
1/C = 1/C1 + 1/C2 + ... |
| How does the electric field and charge quantitiy change when a dielectric is added to a capacitor? |
E is decreased, but the amount of charge is increased. |
| The resistance (R) of a wire is dependent upon the resistivity (rho), the length (l) and the cross-sectional area (A) as? |
R = rho(l)/A |
| Ohm's Law |
V = IR |
| Resistors in series? |
R = R1 + R2 + ... |
| Resistors in parallel? |
1/R = 1/R1 + 1/R2 + ... |
| Units of magnetic field? |
Tesla |
| How does B vary with current and the distance from the current-carrying wire? |
B=kI/r |
| Force on a length L of a current (I)-carrying wire in a magnetic field B? |
F = ILBsin(theta) |
| Force on a charged (q) particle moving with velocity (v) through a magnetic field (B)? |
F = qvBsin(theta) |
| Undeflected motion of a particle through a magnetic field? |
r = mv/qB |
| Lorentz force (sum of electric and magnetic forces)? |
qE = qvB or E=vB |
| Faraday's Law |
induced emf = change in flux/change in time |
| Magnetic flux |
= BA sin (theta) or Q(enclosed)/permittivity |
| Induced current (I) |
=-Blv/R |
| Intensity of a sound wave= |
power/area |
| Transformer rule |
Vp/Np=Vs/Ns or Power in primary side=Power in secondary side |
| Velocity of sound wave= |
freq * wavelength |
| Doppler Effect= |
app freq = freq (v + vo)/(v - vs) |
| Snell's Law |
n1*sin(theta1) = n2*sin(theta2) |
MedTemCP5 Word+Pics
