Category: Magnetism and Electromagnetism

A. 8 N-m
B. 0.48 N-m
C. 0.048 N-m
D. 0.0048 N-m

A. slightly less than unity
B. equal to unity
C. slightly more than unity
D. equal to that ferromagnetic mate rials

A. the voltage across the two ends of exciting coil
B. the flow of an electric current
C. the sum of all currents embraced by one line of magnetic field
D. the passage of magnetic field through an exciting coil

A. the field of a set of parallel conductors
B. the field of a single conductor
C. the field in which all lines of magnetic flux are parallel and equidistant
D. none of the above

A. current, induced e.m.f. and direction of force on a conductor
B. magnetic field, electric field and direction of force on a conductor
C. self induction, mutual induction and direction of force on a conductor
D. current, magnetic field and direction of force on a conductor

A. little
B. lower
C. higher
D. zero

A. radius of conductors
B. current in one conductor
C. product of current in two conductors
D. distance between the conductors

A. Relative permeability
B. Magnetic field intensity
C. Flux density
D. Magnetic potential

A. copper
B. aluminium
C. soft iron
D. brass

A. cobalt
B. chromium
C. nickel
D. tungsten