In the formula V = 1/(2r)^2, if r is halved, then V is multiplied by ?
Choose the correct choice: A) 64 B) 1/8 C) 1 D) 4 E) 1/64
Say r=2 =&gt; V1 = 1/16   when r=1; V2 = 1/4   V2 = 4*V1.   Answer : 4
<result>D</result>
In the formula V = 1/(2r)^2, if r is halved, then V is multiplied by ?