First slide

Electric field

Question

If E_a be the electric field strength of a short dipole at a point on its axial line and E_e that on the equatorial line at the same distance, then

Easy

A

E_e = 2E_a
B

E_a = 2E_e
C

E_a = E_e
D

None of the above

Solution

$E_{a} = \frac{1}{4 {πε}_{0}} \frac{2 q}{r^{3}}; E_{e} = \frac{1}{4 {πε}_{0}} \frac{q}{r^{3}} \Rightarrow E_{a} = 2 E_{e}$

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