A circular loop of wire with 20 turns, radius 0.187 m and resistance 0.295 Ohms

Question

A circular loop of wire with 20 turns, radius 0.187 m and resistance 0.295 Ohms is connected to a 16.3 V power supply. The magnetic field at the center of this loop is

I got .0011819 T for the answer is this correct?


A wire perpendicular to the screen carries a current into the screen (away from you). What is the direction of the magnetic field due to this current at a point due north of the wire?

A. north
B. south
C. east
D. west

I think it's north..is this correct?


A proton moves in a magnetic field as shown in the picture. The direction of the force on the proton is _______. http://www.webassign.net/userimages/B711a.gif?db=v4net&id=84303

A. perpendicular to and into the screen
B. toward the top of the screen
C. toward the bottom of the screen
D. perpendicular to and out of the screen

I think it is perpendicular to and into the screen. Is this correct?

PLEASE SHOW ALL YOUR WORK!

Explanation / Answer

a. apply magnetic field B = u0i/2piR

current i = V/R = 16.3/0.295 = 55.25 Amps

so B = 25* 4pi*10^-7 * 55.25/(2*3.14* 0.187)

B = 0.0014772 T

b. yes north it is

c. D. perpendicular to and out of the screen

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