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Question
A long solenoid carrying current 'I1' produces magnetic field 'B1' along its axis. If the current is reduced to 25% and number of turns per cm are increased four times, then new magnetic field 'B2' is ____________.
Options
B1
16B1
`"B"_1/4`
4B1
MCQ
Fill in the Blanks
Solution
A long solenoid carrying current 'I1' produces magnetic field 'B1' along its axis. If the current is reduced to 25% and number of turns per cm are increased four times, then new magnetic field 'B2' is B1.
Explanation:
`"B"_1 = mu_0 "I"_1 "n"`
`"B"_2 = (4"n") "I"_1/4 mu_0 = "B"_1`
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Magnetic Field of a Solenoid and a Toroid
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