a. current in wire b. strength of magnetic field c. not sure what its asking ple

Question

a. current in wire
b. strength of magnetic field
c. not sure what its asking
please answer a b and c with work. thank you!!!!

A long straight wire is made from carbon (resistivity at room temperature - 3.50 Times 105 Ohm m). The wire is 15.0 m long and has a radius of 5.00 Times 104 m. There is a potential difference of 15.0 V between its ends. Find the current in the wire. Find the strength of the magnetic field at a point that is midway between the wire's ends and a distance of 2.00 Times 10 3 m from the central axis of the wire. Suppose that we wanted to produce this potential difference between the ends of the wire by moving it in a magnetic field with a strength of 2.00 T. Let the wire be perpendicular to the field; let the wire's velocity be perpendicular to the field too. How fast must the wire be moving?

Explanation / Answer

As

R = rho L / A

and

A = pi r^2 = 7.854E-7 m^2

Then

R = 668.45 ohm

Thus,

I = V / R = 0.0224 A or 22.4 mA [ANSWER]

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