Recent content by Melqarthos

Never mind. I got it. we just use this relationship: (dΦ)/(dt)=(BcosΘ)(dA/dt)+(AcosΘ)(dB/dt) + AB(-sinΘ)(dΘ/dt), in which case the last term is equal to zero as the angle does not change. Only the magnitude and area change. Thanks! Melqarthos

What do you mean by geometric relations? I'm not quite sure.

Homework Statement A circular wire loop of radius r= 19 cm is immersed in a uniform magnetic field B= 0.670 T with its plane normal to the direction of the field. If the field magnitude then decreases at a constant rate of −1.2×10−2 , at what rate should increase so that the...

So any suggestions mates? Melqarthos

Maxium Allowable Current to (+/-) 2% ? Homework Statement An experiment on the Earth's magnetic field is being carried out 7.00 from an electric cable. What is the maximum allowable current in the cable if the experiment is to be accurate to 2.0 ? Assume that Earth’s magnetic field is ...

Okay I got it! But there's something I don't get. Why do we treat the radius of the Earth and the distance away from the magnetic dipole as 'one unified' distance, rather than two distances where the distance away from the Earth's surface should be x^2 as according to the magnetic dipole...

I tried the problem again. Check the picture to see my work. I used another value for distance from the North pole. Instead of a distance of 1.4*10^4 I used 1.3*10^4 km. The back of my book says the answer should be 3.6*10^-6 T, but that's not what I got. Meqlarthos

Well from what I understand we know that μ=NIA, which is the magnetic dipole moment of a coil and is considered a vector. I also know that: torque= μ*B This is all useful only when we're messing with currents. We can further our investigation by realizing that we can use μ and sub it into the...

Homework Statement The Earth's magnetic field is essentially that of a magnetic dipole. If the field near the North Pole is about , what will it be (approximately) 1.4×104 above the surface at the North Pole?Homework Equations Apparently we need to use the Biot-Savart Law which I'm not sure...

Ohh I see :) I'll be sure to post the answer soon, just need to get down on paper first! Melqarthos

Homework Statement Estimate the approximate maximum deflection of the electron beam near the center of a CRT television screen due to the Earth's field. Assume the screen is 20 from the electron gun, where the electrons are accelerated by the following voltages. Note that in color TV sets...