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  1. The concentric spheres of radii R and r have positive charges q₁ and q₂ with equal
  2. The area of cross-section of one limb of an U-tube is twice that of the other.
  3. A bomb of mass 30 kg at rest exploded into two pieces of masses 18 kg
  4. Which of the following pairs is wrong
  5. The maximum and minimum intensities of two sources is 4:1. The ratio of amplitude is