Current in a Magnetic Field

Question 1

A Current-Carrying Conductor in a Magnetic Field will always experience a force unless the conductor is parallel to the magnetic field. The direction of the force is always:

Answer 1

Perpendicular to the current

Perpendicular to the magnetic field

Question 2

Fleming’s Left-Hand Rule

Answer 2

States that if the thumb, first finger and second finger of the left hand are held at right angles, with the first finger pointing in the direction of the magnetic field and the second finger pointing in the direction of the current, then the thumb points in the direction of the force

Question 3

Magnetic Flux Density

Answer 3

The magnetic flux density (B) at a point in a magnetic field, is a vector whose magnitude is equal to the force that would be experienced by a conductor of length 1 m carrying a current of 1 A at right angles to the field at that point and whose direction is the direction of the force on a north pole placed at that point

Question 4

Unit of Magnetic Flux Density

Answer 4

The unit of magnetic flux density is the tesla (T)

Question 5

The Tesla

Answer 5

The magnetic flux density at a point is 1 tesla (T) if a conductor of length 1 m carrying a current 1 A experiences a force of 1 N when placed perpendicular to the field

Question 6

The Ampere

Answer 6

The ampere (A) is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible cross section and placed 1 metre apart in a vacuum, would produce a force on each conductor of 2 x 10*-7 newtons per metre of length

Question 7

The Coulomb

Answer 7

The coulomb (C) is the amount of charge that passes any point in a circuit when a current of 1 ampere flows for 1 second