Find the magnetic field at $P$ due to the arrangement shown
$\frac{{{\mu _0}i}}{{\sqrt 2 \,\pi \,d}}\left( {1 - \frac{1}{{\sqrt 2 }}} \right)\, \otimes $
$\frac{{2{\mu _0}i}}{{\sqrt 2 \,\pi \,d}}\, \otimes $
$\frac{{{\mu _0}i}}{{\sqrt 2 \,\pi \,d}}\, \otimes $
$\frac{{{\mu _0}i}}{{\sqrt 2 \,\pi \,d}}\left( {1 + \frac{1}{{\sqrt 2 }}} \right)\, \otimes $
Assertion : A charge, whether stationary or in motion produces a magnetic field around it.
Reason : Moving charges produce only electric field in the surrounding space.
A helium nucleus makes a full rotation in a circle of radius $0.8$ metre in two seconds. The value of the magnetic field $B$ at the centre of the circle will be
A straight wire of diameter $0.5\, mm$ carrying a current of $1\, A$ is replaced by another wire of $1\, mm$ diameter carrying the same current. The strength of magnetic field far away is
Explain experiment which produced magnetic field due to straight long current carrying wire.
When the current flowing in a circular coil is doubled and the number of turns of the coil in it is halved, the magnetic field at its centre will become