22. When the length of the conductor in the current-carrying conductor increases, what happens to the force in the conductor which is at right angles to the magnetic field?
A. Increases
B. Decreases
C. Remains the same
D. Becomes zero
23. When the magnetic field intensity in the current-carrying conductor increases, what happens to the force in the conductor which is at right angles to the magnetic field?
A. Increases
B. Decreases
C. Remains the same
D. Becomes zero
24. The unit for force in a current-carrying conductor is _________
A. Tesla × Ampere × meter
B. Tesla
C. Ampere/meter
D. Ampere × meter
25. If the net force is zero on a particle in a magnetic field what is the relation between velocity and magnetic field?
A. v = E × B
B. v = E/B
C. v = B/E
D. v = 1/(E × B.
26. If the intensity of the magnetic field is 100T, the length of the conductor is 10m and the magnitude of force perpendicular to the magnetic field is 10kN, calculate the current in the conductor.
A. 100 A
B. 100 mA
C. 10 A
D. 10 mA
27. If the intensity of the magnetic field perpendicular to the current-carrying conductor is 100T, the length of the conductor is 3m and the current in the conductor is 10A, calculate the magnitude of force perpendicular to the electric field.
A. 300N
B. 30N
C. 30kN
D. 3kN
28. Force in a current-carrying conductor placed in a magnetic field is ___________ of il and B.
A. dot product
B. scalar product
C. cross product
D. vector addition
29. An E.M.F. can be induced by _________
A. Change in the magnetic field only
B. Change in the area of cross-section only
C. Change in angle between magnetic field and area only
D. Change in the magnetic field, area, or angle between them
30. What happens to the current in a coil while accelerating a magnet inside it?
A. Increases
B. Decreases
C. Remains constant
D. Reverses
31. What is the consequence of the motor effect?
A. Current
B. Voltage
C. Electromagnetic induction
D. EMF