Recent content by David Truong

Homework Statement A single slit illuminated by light of wavelength λ = 610 nm produces a diffraction pattern with its first minimum at 3.5 mm from the central maximum. (a) Find the slit width, and (b) For the same slit, what wavelength of light would produce a first minimum at θ = 4.0...

No I didn't leave anything out, the question is copied verbatim from the question sheet I was given.

Okay, so if I am considering a whole period than my currents are actually +4.4 and - 4.4. Additionally, my period is actually just T = 1/f = 1/20000 = 5.0 x 10^-5. back emf = (5.6 x 10^-5)[+4.4 - (-4.4)/5.0 x 10^-5 secs] = (5.6 x 10^-5)[8.8/5.0 x 10^-5 secs] = (5.6 x 10^-5)(176000) = 9.856 V

So I made this question out to be harder it actually was. I was thinking about the changing electric field in the wrong way. So here's my work: Id = 0.80 x 10^-8 A dE/dt = 1.5 x 10^6 V/m ΦE = EA Id = ε0(ΔΦE/Δt) Id = ε0(A)(ΔE/Δt) A = Id/[ε0 x (ΔE/Δt)] A = 0.80 x 10^-8/(8.85 x 10^-12)(1.5 x...

Homework Statement The electric field between two circular plates of a capacitor is changing at a rate of 1.5 x 10^6 V/m per second. If the displacement current at this instant is Id = 0.80 x 10^-8A, find the dimensions of the plate. Homework Equations Id = ΔQ/Δt = ε0(ΔΦE/Δt) ΦE = EA Q = CV...

Homework Statement The coil in a loudspeaker has an inductance of L = 56uH (or 5.6 x 10^-5 H). To produce a sound frequency of 20 kHz, the current must oscillate between peak values of +2.2 A and -2.2 A in one half of a period. What average back emf is induced in the coil during this variation...

So I believe I figured it out. At peak voltage, the amplitude sinwt is at its peak too, which is equal to 1. Thanks for the help!

Homework Statement A simple electric generator contains a 30-turn coil of area 6.6 x 10^-4 meters squared. The coil spins in a magnetic field of 0.80 T at a frequency of 60 Hz. a) What is the peak output voltage? b) How must the number of turns be changed to maintain the same output voltage...

Homework Statement Two parallel wires both carry currents directed from left to right. A circular wire loop lies in the plane of the two wires midway between them. The currents are positive charges. Sketch the changes in the magnetic fields induced and the resultant current direction in the...

Glad to join. I'm looking forward to understanding physics better.