Download App

Magnetism — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsMagnetism1 Mark
MCQ
Force between two identical bar magnets whose centres are r metre apart is 4.8 N, when their axes are in the same line. If separation is increased to 2r, the force between them is reduced to
  • A
    2.4N
  • B
    1.2N
  • C
    0.6N
  • ✓
    0.3N
✓

Answer

Correct option: D.
0.3N
 0.3N

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from Magnetism→Magnetism — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

For a concave mirror, if real image is formed the graph between $\frac{1}{u}$ and $\frac{1}{v}$ is of the form
→
The north pole of a magnet is brought near a stationary negatively charged conductor. What is the force experienced by it at the poles?
→
Choose the $CORRECT$ option
→
A double slit experiment is performed by using light of wavelength of $6000\,\mathring A$. If distance of screen is $1\,m$ and slits are $0.1\, cm$ apart then calculate angular position of $10^{th}$ bright fringe
→
The muon has the same charge as an electron but a mass that is $207$ times greater. The negatively charged muon can bind to a proton to form a new type of hydrogen atom. How does the binding energy $E_{Bμ}$ of the muon in the ground state of a muonic hydrogen atom  compare with the binding energy $E_{Be}$ of an electron in the ground state of a conventional hydrogen atom ?
→
A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is
→
A uniform wire of resistance $20\,ohm$ having resistance $1\Omega /m$ is bent in the adjoining form of a circle as shown in the figure. If the equivalent resistance between $M$ and $N$ is $1.8 \,\Omega $, then the length of the shorter section is ................ $m$
→
If a lens is cut into two pieces perpendicular to the principal axis and only one part is used, the intensity of the image
→
The graph which represents the correct variation of logarithm of activity (log A) versus time, in figure is
→
A sphere of 4 cm radius is suspended within a hollow sphere of 6 cm radius. The inner sphere is charged to potential 3 e.s.u. and the outer sphere is earthed. The charge on the inner sphere is
→