Recent content by 05holtel

Homework Statement How do you express the current in a discharging capacitor. I know that I = dQ/dt, Qd = Q0e^(-t/RC) I = d/dt (Q0e^(-t/RC)) = (Q/RC)e^(-t/RC) I am confused because taking the derivative of Q0e^(-t/RC)) I think should be (-Q/RC)e^(-t/RC) because the derivative...

Homework Statement A light bulbs brightness can be measured by its power consumption. This in turn will depend on the I, V and R of the light bulb. The light bulb is rated at a power consumption of 1.0W when placed at a voltage of 6.0V. We change the battery from a 6.0V to a 3.0V one. Will...

Homework Statement The refractive index of a material is different for different wavelengths and colours of light. For most materials in the visible range of the electromagnetic spectrum, shorter wavelengths have larger refractive index compared to longer wavelengths. The effect of...

Homework Statement A low power laser is incident at the interface between crown glass (n=1.52), and air at an angle of 45 degrees. The refracted ray into air makes an angle with respect to the normal of the surface that is closest to ... Question 2 answers 27.7 degrees 41.1 degrees...

I am really confused still, I know I have to draw first the magnetic field that Wire 1 makes at the points shown on Wire 2. Use those magnetic fields and the current of Wire 2 to find the forces on Wire 2. Repeat the same procedure for the magnetic field that Wire 2 makes at the points shown...

Oh Yeah,oops Rotating Wire 1 clockwise and Wire 2 counterclockwise would make the magnetic fields go in the same direction. Correct?

Homework Statement Two current carrying wires cross at right angles (like a + sign). Wire 1 has current directed horizontally to the left. Wire 2 has current directed vertically up. If the wires are not restrained, what statement best describes the motion of the wires? A) Wire 1...

Right. Thank you very much

I am confused now.How do I find the frequency then for circular motion Q*ω*r*B = m*ω^2*r I know from this equation the radius cancels but what does this have to do with the frequency

Clarification Q*v*B= m*v^2/r = QB = mv^2/r QB = m(f x wavelength) /r Therefore f = rQB/(m x wavelength) Therefore, the frequency of circular motion for a charged particle moving around in the presence of a uniform magnetic field depends on e) all of the above quantities

Homework Statement The frequency of circular motion for a charged particle moving around in the presence of a uniform magnetic field does not depend on ... a)The radius of the circle b)The mass of the particle c)The charge of the particle d)The magnitude of the magnetic field...

I thought 9.945^-13 is equivalent to 10^-13. So I do not understand why 10^-12 is the answer

Homework Statement GSM networks use microwaves of 20 cm in wavelength. The energy carried by one trillion (10^12) photons of this wavelength is closest to ... Question 1 answers A)10-16 Joules b)10-15 Joules c)10-14 Joules d)10-13 Joules e)10-12 Joules Homework...

Homework Statement How does the resistance of a piece of metal change if both its length and its diameter are reduced to one half their original values? Question 1 answers It is increased to 4 times the original value It doubles It remains unchanged It is halved It is...

Homework Statement At what distance from a carbon nucleus is the electric potential 2.1 V? Carbon atoms have 6 electrons in the atomic shell. Homework Equations v= K Q / r^2 OR K Q / r (NOT SURE) The Attempt at a Solution use voltage potential for point charge Using either v= K Q / r^2...