28-29-30) A charge of 1x10-8C enters magnetic field at 3x102ms-1 If the force on charge is 1.8x10-8N

28) A charge of (1x10-8C) enters a magnetic field at (3x102ms-1) at right angles to the field. If the force on the charge is (1.8x10-8N), what is the magnitude of the field?
A) 6x10-1T B) 6x10-2T C) 6x10-3T D) 6x10-4T
29) 1 Tesla is equivalent to:
A) 1Nm/A B) 1NA/m C) 1Vm/A D) 1N/Am
30) A wire of length 2m carrying a current of 0.60A is oriented parallel to a uniform magnetic field of 0.50T. What is the magnitude of the force it experiences?
A) 0 N B) 0.60N C) 0.15N D) 0.30N