Question
which is correct answers !!
A metallic object holds a charge of -3.8 times 10-6 C. What total number of electrons does this represent? (e = 1.6 times 10-19 C is the magnitude of the electronic charge. 4.2 times 104 6.1 times 1013 2.4 times 1013 1.6 times 1014 Two point charges, separated by 1.5 cm, have charge values of +2.0 and -4.0 mu C, respectively. What is the value of the mutual force between them? (ke = 8.99 times 109 N-m2/C2) 320N 3.6 times 10-8 N 8.0 times 10-12 N 3.1 times 10-3 N Two point charges are separated by 10.0 cm and have charges of +2.00 mu C and -2.00 mu C, respectively. What is the electric field at a point midway between the two charges? (ke = 8.99 times 109 N-m2/C2) 28.8 times 106 N/C 14.4 times 106 N/C 7.19 times 106 N/C zero Two charges, +Q and -Q, are located two meters apart and there is a point along the line that is equidistant from the two charges as indicated. Which vector best represents the direction of the electric field at that point? Vector EA Vector EB Vector Ec The electric field at that point is zero.
Explanation / Answer
1. 2.4*10^13 as n =q/e = 3.8*10^-6/1.6 *10^-19 2.4*10^13
2. 320 N F= kq1q2/r^2
3. zero as E = K(q-q)/r^2 = 0
4. zero as E = K(q-q)/r62
