Question

Electric field strength due to a point charge of $5\mu C$ at a distance of 80 cm from the charge is

• A. $8 \times 10^{4}$N/C
• B. $7 \times 10^{4}$N/C
• C. $5 \times 10^{4}$N/C
• D. $4 \times 10^{4}$N/C

Answer 1

Answer: (B)

$7 \times 10^{4}$N/C

Answer 2

$E = 9 \times 10^{9}.\frac{Q}{r^{2}} = 9 \times 10^{9} \times \frac{5 \times 10^{- 6}}{(0.8)^{2}} = 7 \times 10^{4}N ⥂ / ⥂ C$