Give convection for electric or magnetic field emerging out of the plane of the paper and going into the plane of paper.
Give convection for electric or magnetic field emerging out of the plane of the paper and going into the plane of paper.
A current or a electric or magnetic field emerging out of the plane of the paper is depicted by a dot $\odot$ And a current or a field going into the plane of paper is depicted by a cross $\otimes$.
A current or field emerging out of plane of paper is represented by $\odot$ (dot).
A current or field going inside is represented (going $IP$. by $\otimes$ (cross)).
Note: A dot appears like the tip of an arrow pointed at you, a cross is like the feathered tail of an arrow moving away from you.
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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
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- [AIPMT 1997]
Which of the following gives the value of magnetic field according to, Biot-Savart’s law’
Which of the following gives the value of magnetic field according to, Biot-Savart’s law’
Two concentric circular coils $X$ and $Y$ of radii $16\; cm$ and $10\;cm$ respectively, lie in the same vertical plane containing the north to south direction. Coil $X$ has $20$ turns and carries a current of $16\; A$ coil $Y$ has $25$ turns and carries a current of $18\; A$. The sense of the current in $X$ is anticlockwise, and clockwise in $Y$, for an observer looking at the coils facing west. Give the magnitude and direction of the net magnetic field due to the coils at their centre.
Two concentric circular coils $X$ and $Y$ of radii $16\; cm$ and $10\;cm$ respectively, lie in the same vertical plane containing the north to south direction. Coil $X$ has $20$ turns and carries a current of $16\; A$ coil $Y$ has $25$ turns and carries a current of $18\; A$. The sense of the current in $X$ is anticlockwise, and clockwise in $Y$, for an observer looking at the coils facing west. Give the magnitude and direction of the net magnetic field due to the coils at their centre.
A charge $q$ coulomb moves in a circle at $n$ revolutions per second and the radius of the circle is $r$ metre; then magnetic field at the centre of the circle is
A charge $q$ coulomb moves in a circle at $n$ revolutions per second and the radius of the circle is $r$ metre; then magnetic field at the centre of the circle is