A31 mc charge is positioned on the x axis at x + 8 cm. where should a -70 mc charge be placed (on the positive x-axis) to produce a net electric field of zero at the origin?

“other instruments such as gravimeters and magnetometers are also used in the search for petroleum. extracting crude oil normally starts with drilling wells into an underground reservoir. when an oil well has been tapped, a geologist (known on the rig as the "mudlogger") will note its presence. “ this is what i found on google i hope it