Two point charges, separated by 1.5 cm, have charge values of +2.0 and -4.0 µC, respectively. Suppose we determine that 10 field lines radiate out from the +2.0-µC charge. If so, what might be inferred about the -4.0 mC charge with respect to field lines?
a. 40 radiate in
c. 5 radiate out
b. 20 radiate out
d. 20 radiate in
D
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The magnitude of the magnetic force on a charge depends on
A. the velocity component perpendicular to the magnetic field. B. the magnitude of the charge. C. the magnitude of the magnetic field. D. the sign of the charge. E. Three of the items are correct.
Which of the following is not an allotropic form of carbon?
(a) Ethylene (b) Diamond (c) Buckyball (d) Graphene
On a PV diagram representing an isothermal compression, what is the relationship between the initial P value and the final P value?
A. The initial is greater than the final B. The initial is less than the final C. They may be either – it depends on the temperature of the process D. They may be the same.
Coulomb's Law: Two point charges q = -8.50 µC are fixed 10.0 cm apart along a horizontal bar, as shown in the figure. Their electrical forces will be used to balance the weight of a very small sphere carrying a charge Q = + 15.0 ?C, 10.0 cm from each of them in a place where g = 9.80 m/s2. What is the greatest mass M this sphere can have without falling? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) 
Fill in the blank(s) with the appropriate word(s).