A very small conducting sphere carrying a charge of -23 nC is attached to a forc

Question

A very small conducting sphere carrying a charge of -23 nC is attached to a force gauge and lowered into auniform electric field. A force of 2.0 nNdue east keeps the sphere in equilibrium. What is theE-field at the location of the sphere, assuming air is themedium? [Hint: Use the defining expression for the electricfield. Be especially careful about the sign of the charge and thedirection of F.]
Magnitude
1 N/C

Direction 2 south
east    
west
north 2 south
east    
west
north 2 south
east    
west
north 2

Explanation / Answer

                        Giventhat the charge is q = -23*10-9 C           Theelectric force is F = 2.0*10-9 N east -------------------------------------------------------------        Then the magnetude ofelectric field is E = F /q                                                                     =0.087 N/C        Since the charge is-ve the direction of field is due west.     

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