Correct Answer: Option B

Explanation

Answer: B. 5N

(F ∝ \(\frac{1}{r^2}\); 

doubled r → \(\frac{\text{F}}{4}\) = \(\frac{20}{4}\) = 5 N.)

There is an explanation video available below.

• what does productivity of grass means and what are they? Answer this

  1 Answers   ·   Agricultural Science   ·   12 hours ago
• what are the recommend text in Economics? Answer this

  1 Answers   ·   Economics   ·   7 hours ago
• a compund microscope by lens of focal length 1cm and 5cm.an object placed 1.2cm from the objective lens if a... Answer this

  1 Answers   ·   Physics   ·   1 day ago