Magnetic Force and Magnetic Field

Directions:Express your answer in two decimal places then box your final answer.

1. [9 pts]. A straight wire with length2308cmcarries a current14Awhichis directed to the right and is perpendicular to an unknown uniform magnetic field60. A magnetic force25pNacts on a conductor which is directed downwards.

1. Determine the magnitude and the direction of the magnetic field in the region through which the current passes.
2. If the angle between the current and the magnetic field isthis time, what would be the new value of the magnitude of the new magnetic force?

Pointing System for No. 1:

• What are the given in the problem?(1 pt)
• What are the unknown variables?(1 pt)
• What are the equations that you are going to use?(1 pt)
• Solution and answer for Part A.(3 pts)
• Solution and answer for Part B.(3 pts)

2. [9 pts]. A hypothetical charge-0.14pCwith a mass71fgmoves in a circular path perpendicular to a uniform magnetic field with a magnitude of80mTand is directed into the page. If the speed of the hypothetical charge is60km/s:

1. Determine the radius of the circular path.
2. Determine the time interval required to complete one revolution.

Pointing System for Number 2:

• What are the given in the problem?(1 pt)
• What are the unknown variables?(1 pt)
• What are the equations that you are going to use?(1 pt)
• Solution and answer for Part A.(3 pts)
• Solution and answer for Part B.(3 pts)

3. [12 pts]. A hypothetical charge27pCwith mass81fghas a speed of44km/sand is ejected southward entering a uniform magnetic field of unknown magnitude and direction. If the path traced is clockwise,

q P K B