Answer:
I honestly don't know but that thing looks cool lol
Magnets are different because the molecules in magnets are arranged so that their electrons spin in the same direction.
Answer:
τ = 15N.m
Explanation:
Torque on the rod is given by:
![\tau=F*sin(30\°)*d](https://tex.z-dn.net/?f=%5Ctau%3DF%2Asin%2830%5C%C2%B0%29%2Ad)
![\tau=25*0.5*1.2](https://tex.z-dn.net/?f=%5Ctau%3D25%2A0.5%2A1.2)
![\tau=15N.m](https://tex.z-dn.net/?f=%5Ctau%3D15N.m)
If you were told that gravity contributes as well, and you were given the mass of the rod, you would have to subtract the torque of the weight to this value.
D I believe is the answer but you may want to get a second opinion on that.
<span>The current from the power source will not change when the second light bulb is attached. This is because the current is kept on a single path, it will return to the power source at the same value it left the source at.</span>