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प्रश्न
The magnetic field at any point on the axis of a current element is ______
पर्याय
zero
maximum
minimum
a constant
MCQ
रिकाम्या जागा भरा
उत्तर
The magnetic field at any point on the axis of a current element is zero.
Explanation:
dB = `mu_0/(4pi) (Id"/"sintheta)/r^2`
At any point on the axis θ = 0° ⇒ sin θ = 0
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