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 ?
Correct answer: B. 250 AT/m
- A. 2500 AT/m
- B. 250 AT/m
- C. 25 AT/m
- D. 2.5 AT/m
Explanation
Magnetic field strength is H = NI/l, so H = (50 × 1)/0.2 = 250 ampere-turns per metre. The 200 mm magnetic path length must be converted to 0.2 m.
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