[单选题]
A force of 10 N acts on ak,di/t an:5z( k*u fsu charge of 5.0 mC when it is placed in a uniform electra zu:*fik(knts,u5d / 8t6 w;i 8oba x.c8t4ked)nhw u4 ygo-oic field. What is the magnitude of this xihn 8 a-otgdwew8c4 )ou .t8oy4;k6 belectric field?