12 Questions
What is an electric dipole?
A pair of equal and opposite point charges
Where is the centre of an electric dipole located?
Mid-point between the two charges
Why is the total charge of an electric dipole zero?
Because the charges are equal and opposite
What happens to the electric field of an electric dipole at large distances?
It falls off faster than 1/r^2
Where are the electric field results simple when considering an electric dipole?
On the dipole axis and in the equatorial plane
What happens to the electric fields due to the separated charges in an electric dipole at large distances?
They nearly cancel out
What is the formula for the electric field at a point on the axis of a dipole?
$E = p - \frac{q}{4\pi\varepsilon_0} \frac{1}{r^2}$
In what scenario does the dipole field at large distances not involve the charge q and separation a separately?
When r >> a
What is the formula for the electric field at a point on the equatorial plane of a dipole?
$E = -\frac{p}{4\pi\varepsilon_0} \frac{1}{r}$
What is the formula for the dipole moment vector of an electric dipole?
$p = q \times 2a$
At what point does the magnitude of the dipole field depend only on the distance r?
On the equatorial plane
Which formula represents the electric field at a point on the axis of a dipole at large distances?
$E = \frac{2p}{4\pi\varepsilon_0} \frac{1}{r}$
Learn about electric dipoles, including the definition, direction, and center of a dipole. Understand how the total charge of an electric dipole is zero, but the electric field is not. Explore important concepts related to electric dipoles.
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