Recent content by hellogirl88

A hypothetical atom has five energy levels. How many emission lines will it produce?

Unpolarized light propagating along the x-axis from the left in the image above encounters two polarizing filters in a row. The first filter is oriented with its polarization axis at θ1 = 80 degrees from the y-axis, and the second is oriented with its polarization axis at θ2 = 65 degrees from...

Find the mutual inductance (H) of the solenoid and coil shown below. The solenoid has 5263 turns per meter and an area 112 cm^2, and the coil has 230 turns and an area 19 cm^2. I know that mutual inductance = (N1 Φ1)/ I2 but I have no idea where to begin since they don't provide the...

I have a few statements that I have to discern whether they are true or false and I am down to my last guess and am completely stumped. 1. No EMF will be generated by a coil rotating inside a magnetic field if the axis of rotation is perpendicular to the field. 2. In an electrical...

I finally got it. Thank you so much for your help

Ok, so I did 49/D = 31/D+8 and solved for D...is this value supposed to be where on the Y axis the magnetic field is zero?

So say I pick P as Y = 17, so that point would be 2cm away from wire 1 and 10 cm away from wire 2...how do I use this information to find where the fields are equal?

Well originally I was thinking μo*I1/2π*R = - μo*I2/2π*R, but I know this is wrong. Then I considered I1/R1 = - I2/R2, but I don't think this is right either...so I am still lost

Thank you so so much! It makes much more sense to me now. Another student in my class explained it in a way that implied needing the area of the circles, which is what confused me. Thanks again

Well, circumference = diameter time pi, so would the cross sectional circumference = pi * 1.2cm ? Even so, I am still really confused how to incorporate that into finding the total area of the circle. I understand I should essentially be thinking of the toroid as an inner circle and outer...

well L = 272m, and I am given R and the cross sectional diameter, and I know I need to combine those to get the size of the toroid, but I don't know how to combine them. I've attached a picture that associated with the problem.

Two wires carry current I1 = 49 A and I2 = 31 A in the opposite directions parallel to the x-axis at y1 = 7 cm and y2 = 15 cm. Where on the y-axis (in cm) is the magnetic field zero? I don't even know where to start on this. Any help would be great!

You are going to wrap a toroid with 273 m of copper wire that can carry a current of I = 1.7 A. The toroid has radius R = 16 cm and cross sectional diameter D = 1.2 cm. How large a magnetic field (T) can you make at the average toroidal radius? I have been using the formula B =...

A capacitor is completely charged with 650 nC by a voltage source that had 375 V. The initial air gap of the capacitor above was 7 mm. What is the stored energy if the air gap is now 11 mm?

A capacitor with capacitance of C = 8.5±1 μF has a potential difference of V = 4.5±0.4 Volts. What are the charge on the capacitor and the error in this value, in μC? To find charge I just use Q = C*V correct? And how do I calculate the error? Thank you!