(a) Magnetic field - is the area/region/space around a magnet within which the magnetic effect is felt.
(b) Length of ring (L) - 40 X 10-2m
Cross sectional area (A) = 4 x 10-4m
Permeability of free space ( μo ) = 4∏X 10-7 .. ,
Number of turns (N) = 400 ..
Current (I) = 5A .';
(i) Magnetic flux strength, H = NI
L
H = 400 x 5
40 x 10-2
H = 500A/m
(ii) Flux density (B) = μoH
=4 X 10-7X 5000
Flux density (B) =6.3 x 10-3 T
(iii) Total magnetic flux (~)
..
μoH
4 X 10-7X 5000
6.3 x 10-3 T
= BA
= 6.283 x 10-3 x 4 x 10-4
= 2.513 X 10-4Wb
This question was on electromagnetic field. Many candidates attempted this question. The performance was fair enough.
In part (b) of the question, the computation of H, B and Φ was dreaded by many candidates.Just a few of them attempted the (b) part..
This question was on electromagnetic field. Many candidates attempted this question. The performance was fair enough.
In part (b) of the question, the computation of H, B and Φ was dreaded by many candidates.Just a few of them attempted the (b) part.. .
The expected answers were:
