Midterm One PHY 220 Spring Semester 2018 l. An average human weighs about 650 N.
ID: 1581459 • Letter: M
Question
Midterm One PHY 220 Spring Semester 2018 l. An average human weighs about 650 N. If two such generie humans cach carried 1.0 of excess charge, one positiye and one segative, how fat apart would they have to be for the electric attraction between them to esqual their wight? 2. In the figure below, particle 1 of charge +3e and particke 2 of charge 2 are fixed to an z axis. At what coordinate on the axis is the net electric field of the particles zero? (Express in terms of L). 1 12 3. A proton is released from rest at 2.0 cm in a constant electric field with magnitude 1.50 x 10' NC pointing in the positive a-direction. Find the speed of the proton at = 5.00 cm. 4. An Aluminium wire bar 3.80 m long has a rectangular cross section 1.00 cm by 5.00 cm What is its resistance? 5. How much charge does a 12 V battery have to supply to fully charge a 25 pE capacitor and a 5.0 uF capacitor when they're (e) in parallel and (b) in seris?Explanation / Answer
1)
q1 = q2 = 1C
F = 650 N
r = ?
F = kq1q2 / r^2
r^2 = kq1q2 / F
r = sqrt(kq1q2 / F)
r = sqrt[(9 x 10^9 x 1 x 1) / 650]
r = 3710 m