Can someone please help me with a few physics question?

Question

1. how much current is required to produce a force of 0.96 N on a 75 cm long wire oriented at right angles to a 0.24 T magnetic field?

a. 0.050 A

b. 0.17 A

c. 5.3 A

d. 0.19 A

2. A 0.050-m-long wire is carrying a current of 2.0 A at right angles to a 0.15-T magnetic field. What is the magnitude of the force exerted by the magnetic field on the wire?

a. 0.015 N

b. 0.0037 N

c. 0.67 N

d. 6.0 N

3. when does a magnetic field induce maximum EMF in a wire moving with a constant velocity?

a. when the wire is moved at an angle of 60 degrees to the direction of the magnetic field

b. when the wire ismoved at right angles to the magnetic field

c. when the wire is moved parallel to the magnetic field

d. when the wire is moved at an angle of 30 degrees to the direction of the magnetic field

Answer 1

1 tesla is the magnetic field strength that gives rise to a force of 1 N per metre of a wire carrying 1 amp.

1. how much current is required to produce a force of 0.96 N on a 75 cm long wire oriented at right angles to a 0.24 T magnetic field?

F = L*I*B, L = wire length, I is current and B is magnetic field

75 [cm] = 0.75 [m]

0.96 = 0.75*I*0.24 eq 0.96/0.75/0.24 = I = 5.33 [A]

Answer: 1C

2. A 0.050-m-long wire is carrying a current of 2.0 A at right angles to a 0.15-T magnetic field. What is the magnitude of the force exerted by the magnetic field on the wire?

F = L*I*B, L = wire length, I is current and B is magnetic field

F = 0.050*2.0*0.15 = 0.015 [N]

Answer: 2A

Answer: 3B

Good luck.