1) At a certain location close to Earth's surface, we observe a uniform electric field of...
1) At a certain location close to Earth's surface, we observe a uniform electric field of magnitude 105 N/C directed straight down. What must be the charge (in C) that needs to be placed on a person of mass 84 kg in order to make them lose contact with the ground? Make sure to correctly identify the sign of the charge needed.
2) Determine the magnitude of the force between an electric dipole with a dipole moment of 4 ✕ 10-29 C m and an electron. The electron is positioned r = 14nm from the centre of the dipole, along the dipole axis. Hint: Assume that r >> d, with d the charge separation distance in the dipole.
Homework Answers
1)
Force, = qE = mg
Charge, q = mg/E
q = (84 x 9.8)/10^5
Charge, q = 8.23 x 10^-3 C
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