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After all that it was really simple haha. thanks.

The question required e^x \geq x^e \text{ for }x>0 So i got up to e^x \geq e^{elnx} I'm pretty sure that's right and now I don't know how to get to x^e \text{ from }e^{elnx} thanks.

alright, cool thanks.

hey, can someone tell me the answer for this. this is my working; F/l=kII/d F=kIIl/d F=k(2I)I(2l)/d F=4kIIl/d which is 4 times original so I put D, but the answer says C. Is it because only one wire was doubled?