NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics Magnetic Effects of Current and Magnetism-Current Loop as Magnetic Dipole Study Material (Page 1 of 2)

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Magnetic Dipole in Magnetic Field

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Torque on magnetic dipole

The Torque on Magnetic Dipole

Consider a uniform magnetic field of strength B. Let a magnetic dipole be suspended makes an angle with the field as shown in figure. If ‘m’ is the strength of each pole, the two poles N and S experience two equal and opposite forces ‘mB’ . Then we can say that these forces constitute a couple which tends to rotate the dipole. Suppose the two exerts a torque of magnitude .

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Direction of Magnetic Field, Magnetic Field at the Centre of Circular Current Loop

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Direction of Magnetic Field

Right Hand Thumb Rule

If we hold the straight conductor in the grip of your right hard in such a way that the extended thumb points in the direction of current, then the direction of the curl of the fingers will give the direction of the magnetic field.

Right Hand Thumb Rule

Variation of magnetic field with distance from straight current carrying conductor

Variation of Magnetic Field

Magnetic Field at the Centre of Circular Current Loop

Consider a circular loop of wire of radius r carrying current I. We wish to calculate its magnetic field at the centre O. The entire loop can be divided into a lar…

… (42 more equations, 22 figures) …

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