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Question

The potential in an electric field has the form V=a(x2+y2+z2). The modulus of the electric field at a point (z,y,x) is

A
2a(x2+y2+z2)32
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B
2ax2+y2+z2
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C
ax2+y2+z2
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D
2ax2+y2+z2
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Solution

The correct option is C ax2+y2+z2
Potential in a electric field V=a(x2+y2+z2)
electric field at a point (z,x,y)
dVdx=2ax+0+0=2a where the point =x2+y2+z2
dVdx=ax2+y2+y2

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