HardPhysics
+4 / -1
-- Particles of masses m, 2m, 3m, ... nm are placed on x axis at distances x = r, x = 2r, x = 3r, ... nr from origin. The distance of centre of mass of the system of particles from origin is
A
(n(n+1)/6)r
B
((2n+1)r)/3
C
((n(2n+3)r)/2)
D
(n^2(n+1)r)/2
Previous
-- Two spheres having masses 20 kg and 30 kg, moving in opposite directions with
NextA small bar magnet having pole strength m is placed inside a closed surface. If
More from PYQ2025
Easy
Which of the following is not the unit of length :
Medium-- The speed of light in a medium is 1.5 × 10⁸ m/s. The critical angle for this medium with respect
MediumThe frequency of an electromagnetic wave in free space is 2 MHz. When it passes through a medium of
Easy-- In a p-type semiconductor, the majority charge carriers are
Easy-- The energy of an electron in nth orbit of hydrogen atom is E_n = -13.6/n² eV. The energy required
Medium-- Two magnets of magnetic moments M and 2M are placed in a vibration magnetometer, with like poles
Practice Physics Exams
Full-length mock tests with detailed analytics, rank, and percentile.
Browse Exams