1.) Three charges, each of magnitude 5 nC, are at separate corners of a square o

Question

1.) Three charges, each of magnitude 5 nC, are at separate corners of a square of edge length 7 cm. The two charges at opposite corners are positive, and the other charge is negative. Find the force exerted by these charges on a fourth charge q = +3 nC at the remaining (upper right) corner. (Assume the +x axis is directed to the right and the +y axis is directed upward.) 2.) A simple pendulum of length L = 1.4 m and mass M = 5.0 multiplied by 10-3 kg is placed in a uniform, vertically directed electric field vector E . The bob carries a charge of 8.4

Explanation / Answer

Part 1:

The force exerted by one + ve charge on the charge q is

f1 =9*10^9*5*10^(-9)*q / [0.05] ^2 = 18000 q N

Similarly for the other +ve charge
f2 =18000 q N.

These two are at 90 degree apart.
Their resultant is?2*18000= 25455.84*q N and is along the diagonal and away from the negative charge.
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