State PCS PYQPrelims 2019

UPPCS · প্রশ্ন 47

What happens when some charge is placed on a soap bubble?

  1. Its radius increases
  2. Its radius decreases
  3. The bubble collapses
  4. None of the above
উত্তর দেখান ও ব্যাখ্যা

উত্তর: (A) Its radius increases

ব্যাখ্যা

Charge spreads over the bubble's surface, and the mutual repulsion creates an outward electrostatic pressure, so the radius increases.