My 12-year-old is doing her homework and reading the Dope, God help me.
She asks the following: in The Avengers Movie where Cap, Thor and Iron Man are duking it out in the woods over Loki…
Could Cap’s shield have resisted or otherwise withstood a full-on lightning strike from the God of Thunder? Sure, it’s vibration and impact proof (“You want me to put the hammer down?”) but is it conductive? Strikes both of us that would be significant hole in Caps arsenal.
I went looking up the properties of vibranium, which is what Cap’s shield is made of, and couldn’t find anything about electrical energy.
However, there’s a scene in the movie where Cap deflects an iron man ray blast into a bad guy (a classic Cap/Iron Man combo). I think it’s fairly safe to say that the shield can deflect or absorb non-kinetic energy just fine.
ETA: There are some references to it being an iron-vibranium or adamantium-vibranium alloy, as well.
While I have no evidence to back me up, I would be willing to bet $100 that if you look through all of the Captain America comics that have been made, you will find instances of the shield being used to connect a circuit (making it conductive), absorbing electricity (to save the Cap), and bouncing electricity (to save the Cap and hurt a bad guy).
So the answer is that it is equally as conductive as the plot needs it to be.
Yep; just like it can be thrown through a huge metal pillar to cut it in half, then caught by Cap in flight without ripping his hand off.
The alloy is known to contain both iron and vibranium, and it’s ferromagnetic (not all iron alloys are), but the exact composition is unknown, even in-universe. It certainly is not an adamantium-vibranium alloy: First of all, adamantium is itself an alloy (also known to contain iron and to be ferromagnetic, and with a composition known in-universe, even if it’s not to us) and second, adamantium was developed later, in an attempt to replicate the material of the shield (it was partially successful: It’s just as indestructible, but doesn’t have the magical momentum-absorbing properties).
I think Cap’s shield is a hair more durable than adamantium, though the difference is nothing anybody short of Thor would notice.
Wolverine might be able to deduce it from the empirical evidence. 
Along the lines of Sage Rat’s thinking, in Secret Wars, Captain America takes cover behind his shield while the Human Torch uses his “Nova Flame” in a desperate attempt to stop the nearly indestructible robot Ultron.
It works - something inside Ultron that’s not indestructible melts - and, although the Torch is left powerless for a while, Cap survives without so much as a sunburn thanks to the shield. He should have been incinerated.
Logan is pragmatic to think, “Hmm. I’m not sure what’ll happen if I bang my claws against that shield with everything I got. Might cut the shield; might break the claws. Can’t fix the claws if they break, or, rather, I don’t really want to be attached to them during such a repair. Best hamstring him from behind, take the shield from him after he collapses, and chop his head off with it.”
Logan is pragmatic to think, “Hmm. I’m not sure what’ll happen if I bang my claws against that shield with everything I got. Might cut the shield; might break the claws. Can’t fix the claws if they break, or, rather, I don’t really want to be attached to them during such a repair. Best hamstring him from behind, take the shield from him after he collapses, and chop his head off with it.”
I recall that the Torch hesitated to try the stunt because he didn’t think Cap would survive in such proximity. Clearly a [del]wizard[/del] [del]God [/del]the Beyonder did it.
Yeah, his main shield is definitely not pure vibranium. He did use a vibranium shield for a while, though, when John Walker (formerly Super Patriot, later USAgent) was Captain America and Steve Rogers had to come up with a new identity, the Captain.
The original, unique alloy, shield was considered US govt property, so when Cap got replaced, the new guy got to use it. At first Tony Stark (Iron Man) gave Steve an adamantium shield, but they quickly (like same issue) had a falling out, I think over the Armor Wars, and Steve gave it back.
After that, T’Challa (Black Panther) gave him a vibranium shield, which he used up until being reinstated as Captain America and getting the real one back.
Stark was at least 49.9999% wrong in the Armor Was in general, and entirely in the wrong in his interaction with Cap, but that little episode nonetheless gave me one of my favorite “Steve Rogers gets put in his place” moments. After Stark’s irresponsible actions lead to a major super-villain jailbreak which Cap has to clean up, the latter naturally goes to the former’s mansion to drag his ass to jail. Cap refuses to use the shield in the fight as it would be “tainted,” and thus intends to drag Iron Man in solo and bare-handed. Iron Man quickly and almost effortlessly kicks his ass.