Which of the following gives the value of magnetic field according to, Biot-Savart’s law’
$\frac{{i\Delta l\sin \theta }}{{{r^2}}}$
$\frac{{{\mu _0}}}{{4\pi }}\frac{{i\Delta l\sin \theta }}{r}$
$\frac{{{\mu _0}}}{{4\pi }}\frac{{i\Delta l\sin \theta }}{{{r^2}}}$
$\frac{{{\mu _0}}}{{4\pi }}i\Delta l\sin \theta $
Give convection for electric or magnetic field emerging out of the plane of the paper and going into the plane of paper.
A point charge $Q\left(=3 \times 10^{-12} C \right)$ rotates uniformly in a vertical circle of radius $R(=1 \,mm )$. The axis of the circle is aligned along the magnetic axis of the earth. At what value of the angular speed $\omega$, the eff ective magnetic field at the centre of the circle .............. $rad / s$ will be reduced to zero? (Horizontal component of earth's magnetic field is $30 \,\mu T )$
An electron moves in a circular orbit with a uniform speed $v$. It produces a magnetic field $B$ at the centre of the circle. The radius of the circle is proportional to
The earth's magnetic induction at a certain point is $7 \times {10^{ - 5}}\,Wb/{m^2}.$ This is to be annulled by the magnetic induction at the centre of a circular conducting loop of radius $5 \,cm$. The required current in the loop is......$A$
Show magnetic field lines due to current carrying loop.