A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air?
A63380 N/Wb
B63.38 N/Wb
C6338 N/Wb
D633.8 N/Wb
Correct answer
C. 6338 N/Wb
Explanation
The correct answer is 6338 N/Wb.