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18. Identical charges +q are placed at thecorners of a regular hexagon. The chargethat must be placed at the centre of thehexagon to make the whole system ofcharges in equilibrium is:(A) 5q (B) -5q (C) -1.83q (D) Q.19. Two point charges are located on the axisas follows: charge q18 x 109 C is at x=0 and q,--1 × 10-9 C is at x = 1 cm.What is the net force on the charge q3 2 x10-9 C placed at x-2 cm.(A)+5.4 x 10-4 N along -ve x-direction(B) 2.0 × 10-4 N along +ve x-direction8 x 104 N along+ve x-direction× 10-8 N along+ve x-direction.(C)1.(D) 1.8 |
| Answer» 18. Identical charges +q are placed at thecorners of a regular hexagon. The chargethat must be placed at the centre of thehexagon to make the whole system ofcharges in equilibrium is:(A) 5q (B) -5q (C) -1.83q (D) Q.19. Two point charges are located on the axisas follows: charge q18 x 109 C is at x=0 and q,--1 × 10-9 C is at x = 1 cm.What is the net force on the charge q3 2 x10-9 C placed at x-2 cm.(A)+5.4 x 10-4 N along -ve x-direction(B) 2.0 × 10-4 N along +ve x-direction8 x 104 N along+ve x-direction× 10-8 N along+ve x-direction.(C)1.(D) 1.8 | |