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प्रश्न
A long solenoid has a radius a and number of turns per unit length n. If it carries a current i, then the magnetic field on its axis is directly proportional to ______.
विकल्प
ani
ni
ni/a
n2i
MCQ
रिक्त स्थान भरें
उत्तर
A long solenoid has a radius a and number of turns per unit length n. If it carries a current i, then the magnetic field on its axis is directly proportional to ni.
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