Write the expression for electric field intensity on line charge
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1.6*10^19
is the expression used sigh charge at diople
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Hello mate here is your answer.
Suppose you choose to measure the field at the origin. If you take field generated at the origin by a point at −L−L on the wire, you will have a field with radial and axial components.
But when you take the field generated by the symmetric point LL, the axial components will cancel, and you will have a radial electric field. Since the wire is infinitely long, this will be true fr any point where you want to measure the field.
About the cylindrical symmetry, if you observe the wire from any point, and rotate the wire along its axis, the wire will always be the same for the observer, that's why. And there is no angular field becaus charges always produce radial fields, so think of the distribution of charges in a wire, how could they produce an angular component?
Finite wire
If you wire is of size LL, the argument above is valid only at the middle point. Otherwise you will have axial components of electric field (wich can be calculated with Gauss's Law.
Hope it helps you.
Suppose you choose to measure the field at the origin. If you take field generated at the origin by a point at −L−L on the wire, you will have a field with radial and axial components.
But when you take the field generated by the symmetric point LL, the axial components will cancel, and you will have a radial electric field. Since the wire is infinitely long, this will be true fr any point where you want to measure the field.
About the cylindrical symmetry, if you observe the wire from any point, and rotate the wire along its axis, the wire will always be the same for the observer, that's why. And there is no angular field becaus charges always produce radial fields, so think of the distribution of charges in a wire, how could they produce an angular component?
Finite wire
If you wire is of size LL, the argument above is valid only at the middle point. Otherwise you will have axial components of electric field (wich can be calculated with Gauss's Law.
Hope it helps you.
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