Author Question: A straight wire carries a current of 40 A in a uniform magnetic field (magnitude = 80 mT). If the ... (Read 150 times)

leo leo · **on:** Jul 28, 2018

A straight wire carries a current of 40 A in a uniform magnetic field (magnitude = 80 mT). If the force per unit length on this wire is 2.0 N/m, determine the angle between the wire and the magnetic field.
a. either 39 or 141
b. either 25 or 155
c. either 70 or 110
d. either 42 or 138
e. either 65 or 115

Question 2

A charged particle (mass = M, charge = Q > 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with speed V?
a. QVB toward the east
b. Zero
c. QVB toward the west
d. QVB upward
e. QVB toward the south