# A point charge of magnitude $6 \mu C$ is placed at point M. The distance of point M from a test charge of unit magnitude, placed at point N, is $8 \times 10^{−2}\; m$. What will be the potential of point N if the test charge is replaced by a charge of magnitude $3 \mu C$?

$(C) 6.75 \times 10^5 V$