### Right Hand Palm Rule

If we hold the thumb of right hand mutually perpendicular to the grip of the fingers such that the curvature of the finger represents the direction of current in the wire loop, then the thumb of the right hand will point in the direction of magnetic field near the centre of the current loop**Graph of B v/s x**As soon as x increases magnetic field B decreases, dependence of B on x is shown in figure Rate of change of B with respect to x is different at different values of x for $x<\pm \frac{a}{2}$ curve is convex and $\quad$ for $x>\pm \frac{a}{2}$ curve is concave At $x=\pm \frac{a}{2} \quad$ we get $\frac{d B}{d x}=$ const $,$ and $\frac{d^{2} B}{d x^{2}}=0$ So at $x=+\frac{a}{2} \&-\frac{a}{2}$ B varies linearly with $x$ These points are called point of inflexion. Distance in between these two points is equal to radius of the coil $B=\frac{B_{C}}{\left(1+\frac{x^{2}}{a^{2}}\right)^{3 / 2}}$ $\because$ Magnetic field at the centre of coil $\mathrm{B}_{\mathrm{C}}=\frac{\mu_{0} \mathrm{NI}}{2 \mathrm{a}}$

#### Also Read:

Biot Savart’s Law**Click here for the Video tutorials of Magnetic Effect of Current Class 12**

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In right hand palm rule, you have described many things but not a single point “palm” is used. It should not have palm word in the law. Also, right hand palm rule means and describes some thing different. please modify it