olenoid is constructed by wrapping 52 turns of wire around a cylinder with a cross-sectional area of 8.0 x 10-4 m2. When the solenoid is shortened by squeezing the turns closer together, the inductance increases to 9.30 x 10-5 H. Determine the change in the length of the solenoid.

the answer is

i think the answer would be b

Two 10¢ coins (dimes) carrying identical charges are lying 2.5 m apart on a table. if each of these coins experiences an electrostatic force of magnitude 2.0 n due to the other coin. the charge on each coin is : 52.2 uc

total distance/total time

(85 + 82)/(5+3)

167/8

20 just over