Download App

Magnetism And Matter — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsMagnetism And Matter1 Mark
MCQ
Electromagnets are made of soft iron because soft iron has:
  • A
    High retentivity and high coercive force.
  • B
    High retentivity and low coercive force.
  • C
    Low retentivity and high coercive force.
  • ✓
    Low retentivity and low coercive force.
✓

Answer

Correct option: D.
Low retentivity and low coercive force.

Electro magnets arc made of soft iron because soft iron has Low retentivity and Low coercive force.

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 And Matter→Magnetism And Matter — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

A deuteron and an alpha particle having equal kinetic energy enter perpendicular into a magnetic field. Let $r_{d}$ and $r_{\alpha}$ be their respective radii of circular path. The value of $\frac{r_{d}}{r_{\alpha}}$ is equal to
→
In a vessel of $21\, cm$ depth, upto what height the water should be filled so that now it appears to be $20\%$ filled if viewed from the top........$cm$ $(\mu_{water} - 4/3)$
→
A $100\%$ efficient transformer has $100$ turns in the primary and $25$ turns in its secondary coil. If the current in the secondary coil is $4\, amp$, then the current in the primary coil is.....$amp$
→
Two light sources with equal luminous intensity are lying at a distance of $1.2\, m$ from each other. Where should a screen be placed between them such that illuminance on one of its faces is four times that on another face
→
$\text{LEDs}$ have the following advantages over conventional incandescent low power lamps:
→
The image which can be obtained on a screen is called:
→
A certain metallic surface is illuminated with monochromatic light of wavelength, $\lambda$. The stopping potential for photo-electric current for this light is $3 V_0$  . If the same surface is illuminated with light of wavelength $2\lambda$, the stopping potential is $V_0$. The threshold wavelength for this surface for photo- electric effect is
→
Two electric bulbs whose resistances are in the ratio of 1 : 2 are connected in parallel to a constant voltage source. The powers dissipated in them have the ratio
→
An $LED$ (Light Emitting Diode) is constructed from a $p-n$ junction based on a certain $Ga-As-P$ semi-conducting material whose energy gap is $1.9\, eV$. What is the wavelength of the emitted light?
→
A voltmeter of resistance $20000\,\Omega$ reads $5$ volt. To make it read $20$ volt, the extra resistance required is
→