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Maximum current and Electric field in wire

Please someone help me, i posted here before and got no reply :(

How do you find the maximum current and the largest electric field in the wire for the bottom question?

Two 10-cm-diameter metal plates are 1.0 cm apart. They are charged to +/-12.5 nC. They are suddenly connected together by a 0.224-mm-diameter copper wire stretched taut from the center of one plate to the center of the other.
 
B = [tex]\mu[/tex]oI[tex]/[/tex]2[tex]\pi[/tex]r

B is magnetic field, I is current, r is radius of the magnetic field(i think), and [tex]\mu[/tex]0 is equal to 4[tex]\pi[/tex] x 10-7

Those pi's aren't superscripted, it is just being difficult.
 

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