When the current through the coil of an electromagnet reverses, the – McqOptions

MCQOPTIONS

1.	When the current through the coil of an electromagnet reverses, the
A.	direction of the magnetic field reverses
B.	direction of the magnetic field remains unchanged
C.	magnetic field expands
D.	magnetic field collapses
Answer» B. direction of the magnetic field remains unchanged

Discussion

No Comment Found

Related MCQs

What is the reluctance of the circuit in problem 9 if the flux is 275 Wb?
There is 900 mA of current through a wire with 40 turns. What is the reluctance of the circuit if the flux is 400 Wb?
What is the reluctance of a material that has a length of 0.07 m, a cross-sectional area of 0.014 m, and a permeability of 4,500 Wb/At × m?
The voltage induced across a certain coil is 200 mV. A 120 resistor is connected to the coil terminals. The induced current is
Which of the following is expected to have the maximum permeability ?
The attraction capacity of electromagnet will increase if the
The main constituent of permalloy is
The initial permeability of an iron rod is
The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields
The uniform magnetic field is