Electronics - Magnetism and Electromagnetism

Exercise : Magnetism and Electromagnetism - Filling the Blanks
1.

When the current through a coil reverses direction, the magnetic field around the coil _____.
does not change
disappears
increases in strength
reverses direction
Answer: Option
Explanation:
No answer description is available. Let's discuss.

2.
The flux density is ___ when the magnetic flux is 9 µWb and the cross-sectional area of the magnetic field is 5 × 10–3 m2.
1800 µT
555.56 T
9 µT
5 × 10–3 T
Answer: Option
Explanation:
No answer description is available. Let's discuss.

3.
After the magnetizing force has been removed, the ratio of the remaining magnetic flux to the saturated magnetic flux is called _____________.
saturation
retentivity
hysteresis
coercivity
Answer: Option
Explanation:
No answer description is available. Let's discuss.

4.
You can determine the direction of the lines of force surrounding a conductor by using _____.
the right-hand rule
the left-hand rule
Lenz's law
Faraday's law
Answer: Option
Explanation:
No answer description is available. Let's discuss.

5.
A group of force lines going from the north pole to the south pole of a magnet is called the magnetic ___.
retentivity
reluctance
hysteresis
flux
Answer: Option
Explanation:
No answer description is available. Let's discuss.