An electromagnet has 50 turns, 1A current, and a 200 mm magnetic path length; what is its magnetic field strength ?
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Answer: B. 250 AT/m
Explanation
Magnetic field strength is calculated by multiplying turns by current and dividing by path length. Dividing fifty turns multiplied by one ampere by zero point two meters yields 250 AT/m. Applying this standard formula ensures precise evaluation of magnetizing force inside magnetic cores. Magnetic field strength represents magnetomotive force divided by the length of the magnetic path. Ampere-turns per meter serve as the standard international unit for measuring field strength. Path length must always be converted into standard meters before performing calculation steps.
Designing efficient solenoids and electromagnets requires calculating required field strengths accurately. Core magnetization curves use field strength values to determine resulting flux densities. Industrial relay coils are engineered using these exact formulas to ensure reliable switching operation. Option A is ten times higher than the correct calculated magnetic field strength value. Option C is ten times lower than the correct calculated magnetic field strength value. Option D underestimates the correct field strength by a factor of one hundred.
- Subject
- Engineering
- Category
- Electrical Engineering
- Topic
- —
- Difficulty
- medium
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