ISAAC Physics help - its given me a headache :)

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Sclaremonths
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Hi, I got stuck on these issac phyiscs questions
for part A i figured:
I = nAve
which means
n = 6.24*10^8
v= 5 m/s (given in the question)
and e is the elementary charge
but how do I work out A?
Is this the right approach?

Part B baffled me i didn't know what ideas to put down
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Last edited by Sclaremonths; 2 months ago
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username5737602
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Well Q = I/T. So you should work out the number of electrons passing this brush per second. Then multiply this value the charge of an electron to find the current.
And in part b, its pretty much the same thing but this time you have to the protons positive charge which cancels out some of the electrons negative charge so the overall current will be less

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not sure this is 100% right but I think it is
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