A vertical wire kept in the Z-X plane carries | vedclass

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(D) To find the direction of the magnetic field at the origin $O$ due to the current flowing in the wire from $Q$ to $P$,we use the Right-Hand Thumb R

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$OY'$

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(D) To find the direction of the magnetic field at the origin $O$ due to the current flowing in the wire from $Q$ to $P$,we use the Right-Hand Thumb Rule.$1$. Point the thumb of your right hand in the direction of the current,which is along the positive $Z$-axis (from $Q$ to $P$).$2$. Curl your fingers around the wire. At the origin $O$,which lies to the left of the wire (along the negative $X$-axis direction relative to the wire),the fingers will point into the plane of the paper.$3$. In the given coordinate system,the $Y$-axis points out of the plane and the $Y'$-axis points into the plane.$4$. Therefore,the magnetic field at the origin $O$ is directed along the negative $Y$-axis,which is $OY'$.

$A$ vertical wire kept in the $Z-X$ plane carries a current from $Q$ to $P$ (see figure). The magnetic field due to the current will have the direction at the origin $O$ along

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