007 (part 1 of 3) 10.0 points 008 (part 2 of 3) 10.0 points A long, cylindrical

Question

007 (part 1 of 3) 10.0 points 008 (part 2 of 3) 10.0 points A long, cylindrical wire of radius 1 mm What is the magnetic field inside the wire a 10 2 r is made of a material of resistivity distance r a from its axis 8.48 x 10 2. m and carries a uniform cur 009 (part 3 of 3) 10.0 points rent density J. The power dissipated per unit 1 440 J a a An electron is a distance r 2 a from the length in the wire is 3 W/m. wire axis and has a velocity parallel to the What is the electric field inside the wire? 2. Answer in units of N/C wire axis with a speed one-tenth the speed of light. A40 Jr What is the magnitude of the force on the 3. electron (Answer in N.) 2 T a Answer in units of N 2a. 2 a 2 Tr 2 r 2 r H40 J a 2 TT

Explanation / Answer

let i si the current through the wire

let L is the length of the wire

R = rho*L/A

P = i^2*R

P = i^2*rho*L/A

i = sqrt( (P/L)*A/rho)

= sqrt(3*pi*1^2*10^-6/8.48*10^-7)
= 3.333 A

B = mue*I/(2*pi*r)
= 4*pi*10^-7*3.333/(2*pi*2*10^-3)
= 3.333*10^-4 T

F = q*v*B*sin(90)
= 1.6*10^-19*3*10^7*3.333*10^-4
= 1.6*10^-15 N

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