Question

Vertices of a regular hexagon of sides 3 cm have three positive and negative charges each of magnitude q = 1.5 nC as shown in diagram. A point charge of Q = 5nC is placed at centre of hexagon. The net force on 5 nC is-

• A. 9 × 10⁹ N
• B. Zero
• C. 90 × 10^–9 N
• D. 90N

Answer 1

Answer: (B)

Zero

Answer 2

F_R is the resultant of two (2F) forces

F_R = 2(2F) cos$\frac { 120 ^ { \circ } } { 2 }$ = 2F

Hence net force is 0.