1.

Magnitude of point charge due to which electric field 30cm away has magnitude 2nc^-1 will be

Answer»
hi,

electrric field due to apoint charge at a DISTANCE X from it

                =  1/4¶ε Q/ x^2

              2  = 8.9 *10^9  *q  /  (.30)^2 

               q = 2* .09 / 8.9   * 10^-9

                  =  2.02 * 10^-11   C



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