[单选题]
A 5.0-C charge is 10,aosw p::j*lnm3 wep 9uxt.c . ml4n/8j1bk/bdkv (eqi( o5sz h from a small test charge. What is the magnitude of the force experienced by a 1.0 nC charge placed at( z4oel/b/vi518shkbqjd k n( the location of the test charge?
A. $0.045 \; N$
B. $0.45 \; N$
C. $4.5 \; N$
D. $45 \; N$