MCQ
In a cassette player, material used for coating magnetic tapes is:
- Acobalt
- B$\ce{CoFe_2O_4}$
- ✓$\ce{NiFe_2O_4}$
- Dnickel
✓
Answer
Correct option: C.
$\ce{NiFe_2O_4}$
In cassette player, materials used for magnetic tapes is $\ce{NiFe_2O_4}$.
Ferrites $($Ferromagnetic material$)$ is used for Coating magnetic tapes.
In cassette player or for building memory store in modern computers.
Most common ones are $\ce{MnFe_2O_4, FeFe_2O_4}$, $\ce{NiFe_2O_4}$ etc.
Ferrites $($Ferromagnetic material$)$ is used for Coating magnetic tapes.
In cassette player or for building memory store in modern computers.
Most common ones are $\ce{MnFe_2O_4, FeFe_2O_4}$, $\ce{NiFe_2O_4}$ etc.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A $PN-$ junction has a thickness of the order of
→In Young's double slit experiment $10^{th}$ order maximum is obtained at the point of observation in the interference pattern for $\lambda=7000\; \mathring A$. If the source is replaced by another one of wavelength $5000\; \mathring A$ then the order of maximum at the same point will be -
→A ray of light is incident at 50° on the middle of one of the two mirrors arranged at an angle of 60° between them. The ray then touches the second mirror, get reflected back to the first mirror, making an angle of incidence of
The minimum distance between an object and its real image formed by a convex lens of focal length f is:
A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm. The power of combination is
Two charges, each equal to $q$, are kept at $x = -a$ and $x = a$ on the $x-$axis. A particle of mass $m$ and charge $q_0=\frac{q}{2}$ is placed at the origin. If charge $q_0$ is given a small displacement $(y < < a)$ along the $y-$axis, the net force acting on the particle is proportional to
→An insect starts moving up in a liquid from point $O$ of variable refractive index $\mu = \mu_0(1 + ay)$ where $y$ is depth of liquid from the surface. If $u$ is the speed of insect, its apparent speed to the observer $E$ is
→The ratio of momenta of an electron and an $\alpha$-particle which are accelerated from rest by a potential difference of 100 V is
→Flux $\phi $ (in weber) in a closed circuit of resistance $10\, ohm$ varies with time $t$ (in $sec$) according to the equation $\phi = 6t^2 - 5t +1$ . What is the magnitude of the induced current at $t = 0.25\, s$ ?.....$A$
→Given below are two statements : One is labelled as Assertion $A$ and the other is labelled as Reason $R$.
→Assertion $A$ : $n - p - n$ transistor permits more current than a $p-n-p$ transistor
Reason $R$ : Electrons have greater mobility as a charge carrier
Choose the correct answer from the options given below