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thanks for the clarification

in the Formula for force on current carrying conductor it reads as: F=BILsinΘ where B is magnetic field strength, I is current and L is length of wire. does it matter what angle theta is if the force is into or out of the page, as in will the force be the same on the wire if it as at any angle...

yes you are right the text book answer is 25, thank you very much

if f'(x)=4x-3 and f(2)=7 find f(4) thank you

i believe you have a made a mistake but please correct me if i am wrong where you wrote (4/5)^n>9/10, it is meant to be (4/5)^n<1/10 as the number of layers you want to cut out is 9/10 and leave 1/10 light remaining thanks :)