A. core length increases i
B. core area increases
C. flux density decreases
D. flux density increases
Related Mcqs:
- Core of an electromagnet should have____________?
A. low coercivity
B. high susceptibility
C. both of the above
D. none of the above - The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength ?
A. 2500 AT/m
B. 250 AT/m
C. 25 AT/m
D. 2.5 AT/m - Magnetism of a magnet can be destroyed by_____________?
A. heating
B. hammering
C. by inductive action of another magnet
D. by all above methods - What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m ?
A. 2 AT
B. 4 AT
C. 6 AT
D. 10 AT - The relative permeability of materials is not constant
A. diamagnetic
B. paramagnetic
C. ferromagnetic
D. insulating - The magneto-motive force is______________?
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 - One maxwell is equal to____________?
A. 10 webers
B. 10 webers
C. 10 webers
D. 10 webers - Two infinitely long parallel conductors in vacuum any separated 1 metre between centers >then a current of 1 ampere flows the. uk each conductor, produce on each other a force of_________________?
A. 2 x 1(T2 N/m)
B. 2 x KT3 N/m
C. 2 x 10″5 N/m
D. 2x 1(T7 N/m) - The use of permanent magnets is. not made in_____________?
A. magnetoes
B. energy meters
C. transformers
D. loud-speakers - Air gap has_________eluctance as compared to iron or steel path?
A. little
B. lower
C. higher
D. zero
