The combination of two separated point charges of opposite sign but equal magnit
ID: 251282 • Letter: T
Question
The combination of two separated point charges of opposite sign but equal magnitude is called an electric: An airplane is flying through a thundercloud at a height of 3,000 m. (This is a very dangerous thing to do because of updrafts, turbulence, and the possibility of electric discharge.) If there is a charge concentration of +38 C at height 4,000 m within the cloud and -38 C at height 1,500 m. what is the magnitude of the electric field E at the aircraft? (ke = 8.99 Times 10^9 Nm^2/C^2) Two point charges each have a value of 31.7 mC and are separated by a distance of 4 cm. What is the electric field midway between the two charges? (ke = 8.99 Times 10^9 N m^2/C^2) The small objects are suspended from threads. When the object are moved close together, they attract one another.Explanation / Answer
3) dipole (option b)
4) Since these are opposite-polarity charges and the plane is between them, both fields are in the same direction at the plane, so the field magnitudes add.
k = Coulomb constant
|E1| = kq1/r1^2 = 8.99E9*38/(4000-3000)^2 V/m = 341620 V/m
|E2| = kq2/r2^2 = 8.99E9*38/(3000-1500)^2 V/m = 151831.11 V/m
Etotal = |E1|+|E2| =341620 +151831.11= 493451.11 V/m (option d)
5) The electric field is zero in the midpoint. Since the two charges have exactly the same charge all the line corresponding to an equal distance to the two charges have electric field zero as they will cancel each other at this line. (option d)