Download App

Magnetic Materials — Physics STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 SciencePhysicsMagnetic Materials4 Marks
Question
What is an electromagnet?
✓

Answer

An electromagnet is an insulated coil wrapped around a ferromagnetic core $($usually a soft iron$)$ of high permeability and low retentivity. When a current is passed through the coil$-a $ solenoid or toroid, the ferromagnetic material magnifies the magnetic field of the coil, the magnification factor being the relative permeability $(\mu / \mu _0)$ of the core. The magnetic field of the current$-$carrying coil magnetizes the core material, thereby producing a much larger field than the coil would produce by itself.

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 "Answer the following in Detail" from Magnetic Materials→Magnetic Materials — all question types→Physics STD 12 Science question papers→Maharashtra Board STD 12 Science question papers→Maharashtra Board question paper generator→

Similar questions

What is a conical pendulum? Obtain an expression for its time period
→
Derive an expression for the electric potential due to an electric dipole.
→
Obtain an expression for energy of an electron in Bohr orbit. Hence obtain the expression for its binding energy.
→
Define ideal simple pendulum and obtain an expression for its periodic time.
→
Explain the linear velocity of a particle performing circular motion.
OR
Derive the relation between the linear velocity and the angular velocity of a particle performing circular motion.
→
What is meant by damped oscillations ? Draw a neat, labelled diagram of a damped spring-and-block oscillator.
→
Express the equation of a simple harmonic progressive wave in different forms.
→
The period of oscillation of a simple pendulum increases by $20 \%$ when the length of the pendulum is increased by $44 cm$. Find its
(i) initial length
(ii) initial period of oscillation at a place where $g$ is $9.8 m / s ^2$.
→
How does the energy stored in a charged capacitor change if the plates of the capacitor are moved farther apart
(i) after the battery is disconnected
(ii) the battery remaining connected?
→
Why two or more mercury drops form a single drop when brought in contact with each other?
→