Q. A glass rod rubbed with silk is used to charge a gold leaf electroscope and the leaves are observed to diverge. The electroscope thus charged is exposed to $X$-rays for a short period. Then
A) The divergence of leaves will not be affected
B) The leaves will diverge further
C) The leaves will collapse
D) The leaves will melt
Explanation
(b) Charge on glass rod is positive, so charge on gold leaves will also be positive. Due to $X$-rays, more electrons from leaves will be emitted, so leaves becomes more positive and diverge further
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.