1. A 4 C charge moving horizontally through a 0.2 T magnetic field that points v

Question

1. A 4 C charge moving horizontally through a 0.2 T magnetic field that points vertically downward experiences a magnetic force of 80 N pushing it horizontally toward the southwest. the charge? What is the velocity (magnitude and direction) of 2. A horizontal wires runs north-south and carries a current of 10 A to the north. What is the magnitude and direction of the magnetic field produced by this current at a point 5 cm directly below the wire? 3. Using the right hand rule, complete the chart (fill in the blanks) below with the correct direction for the (The first row is completed as an example). PaIvu aulvw Magnetic Field: East North Vertically Upward 30° South of East Force on + charge: Vertically Downward Velocity or current: Vertically upward Northwest Vertically Downward Vertically Downward West Determine the net magnetic field produced at point P by the three straight currents of figure 1. All currents run perpendicularly into the page 4. 12 cm 5A 0 2 A

Explanation / Answer

1) Given that charge q = 4 C

B = 0.2 T

F = 80 N

Force F = q*v*B*sin(theta)

theta= 90 deg

then

F = q*v*B

80 = 4*v*0.2

v = 80/(4*0.2) = 100 m/sec

and direction is north west

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