Electronics and Communication Engineering - Exam Questions Papers - Discussion
Discussion Forum : Exam Questions Papers - Exam Paper 5 (Q.No. 26)
26.
Find E at P(1, 1, 1) caused by four identical 3 nC point charges located at P1(1, 1, 0), P2(- 1, 1, 0), P3(- 1, - 1, 0) P4(1, - 1, 0)
21.58ax + 21.58ay + 12az V/m
6.82ax + 6.82ay + 32.89az V/m
-6.82ax - 6.82ay - 32.89az V/m
-21.58ax - 21.58ay - 12az V/m
Answer: Option
Explanation:
E = 6.82ax + 6.82ay + 32.89az V/m
r = ax + ay + az
r1 = ax + ay
r2 = - ax + ay
r3 = - ax - ay
and r4 = ax - ay
∴ r - r1 = az;
r - r2 = 2ax + az;
r - r3 = 2ax + 2ay + az
r - r4 = 2ay + az
= 6.8ax + 6.8ay + 32.9az .
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