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Physics · PYQ NEET UG 2019(1)

हिन्दी

A hollow metal sphere of radius R is uniformly charged. The electric field due to the sphere at a distance r from the centre:

  1. Zero as r increases for r < R, increases as r increases for r > R
  2. decreases as r increases for r < R and for r > R
  3. increases as r increases for r < R and for r > R
  4. zero as r increases for r < R, decreases as r increases for r > R

Correct answer · Option 4

zero as r increases for r < R, decreases as r increases for r > R

Explanation

Inside a hollow metal sphere (\( r < R \)), electric field is zero. Outside (\( r > R \)), \( E \propto \frac{1}{r^2} \), so it decreases as \( r \) increases.
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