(物理)電磁學問題

1. two small objects,A and B,are fixed in place and separated by 2.00cm. Object A has a charge of +1.00uC,and object B has a charge of -1.00uC.How many electrons must be removed from A and put onto B to make the electrostatic force that acts on each object an attractive force whose magnitude is... show more 1.
two small objects,A and B,are fixed in place and separated by 2.00cm.

Object A has a charge of +1.00uC,and object B has a charge of

-1.00uC.How many electrons must be removed from A and put onto

B to make the electrostatic force that acts on each object an attractive

force whose magnitude is 45.0N?

(A) 2.6*10^11 (B) 2.6*10^12 (C) 2.6*10^13 (D) 2.6*10^14

2.
A rectangle has a length of 2d and a height of d.Each of the following

three charges is located at a corner of the rectangle: + q1 (upper left

coener ), + q2 (lower right corner),and - q (lower left corner).

The net electric field at the (empty) upper right corner is zero.Find the

magnitude of q1 and q2.

(A) q1=0.895q , q2= 0.0716q (B) q1=0.0716q , q2=0.895q

(C) q1=0.0895q , q2=0.716q (D) q1=0.716q , q2=0.0895q
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