Two short bar magnets of magnetic moments $m$ each are arranged at the opposite corners of a square of side $d$ such that their centres coincide with the corners and their axes are parallel. If the like poles are in the same direction, the magnetic induction at any of the other corners of the square is
Two short bar magnets of magnetic moments $m$ each are arranged at the opposite corners of a square of side $d$ such that their centres coincide with the corners and their axes are parallel. If the like poles are in the same direction, the magnetic induction at any of the other corners of the square is
- A
$\frac{{{\mu _0}}}{{4\pi }}\frac{m}{{{d^3}}}$
- B
$\frac{{{\mu _0}}}{{4\pi }}\frac{{2m}}{{{d^3}}}$
- C
$\frac{{{\mu _0}}}{{4\pi }}\frac{m}{{2{d^3}}}$
- D
$\frac{{{\mu _0}}}{{4\pi }}\frac{{{m^3}}}{{2{d^3}}}$
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$B_H$ $=$ Horizontal component of earth's magnetic field; $B_V$ $=$ Vertical component of earth's magnetic field and $B =$ Total intensity of earth's magnetic field
The correct relation is
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- [AIPMT 1997]
Explain geographic meridian and magnetic meridian.
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A dip circle is adjusted so that its needle moves freely in the magnetic meridian. In this position, the angle of dip is $40°$. Now the dip circle is rotated so that the plane in which the needle moves makes an angle of $30°$ with the magnetic meridian. In this position the needle will dip by an angle
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