Problem 1 (1 poin). A point charge of +3 106 C is 12.0 cm distant from a second

Question

Problem 1 (1 poin). A point charge of +3 106 C is 12.0 cm distant from a second point charge of 1.5 106 C. Calculate the magnitude of the Coulomb force on each charge (a) 2.81 N; (b) 0.000281 N; (c) 3.125×10-14 N; (d) 0.000281 N/C; (d) none of those Problem 2 (I points). The electric field at a point 20 cm distant from a charge Q is equal to 9x 10 N/C by magnitude. The electric field at that point is directed toward the charge. Find the charge (a) Q=+25000 C; (b) Q:+4*10-sC; (c)Qs-4*105C; (d) Q=-0.0002 C; (e) none of those Problem 3 ( poin). How much work is required to move a charge of +4 10 C from a point 3 m away to a point 1 m away from a point charge of +60 106 C? (a) 1.44J; (b) 2.16J; (c) 0.72 J; (d) 2.88J; (e) none of those Problem 4 (1 point). Point P is midway between-9.0*106 C and +6 106 C charges, which are 20 cm apart. Find the electric potential at point P. (a) 1.35 10 v; (b) -270000 Volts; (c) 270000 Volts N/C; (d) -135000 V; (e) none of those Note: 1 cm = 0.01 m

Explanation / Answer

1)
F= kq1q2/r2
F= 9x109x3x10-6x1.5x10-6/0.122
F = 2.81 N  

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