Question
Among the following _____ has the highest retentivity.
✓
Answer
- Steel
The power of magnetism after the inducing agency is removed, is called Retentivity of a substance.
Retentivity is used for remanence measured in units of magnetic flux density.
Steel retains magneto-field longer, iron acquires the field easier but decays sooner.
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
In a circuit inductance $L$ and capacitance $C$ are connected as shown in figure. $A_{1}$ and $A_2$ are ammeters.
When key $K$ is pressed to complete the circuit, then just after closing key $(K),$ the readings of $A_{1 }$ and $A_2$ will be.
→When key $K$ is pressed to complete the circuit, then just after closing key $(K),$ the readings of $A_{1 }$ and $A_2$ will be.
The reading of a high resistance voltmeter when a cell is connected across it is 2.2 V. When the terminals of the cell are also connected to a resistance of 5Ω the voltmeter reading drops to 1.8 V. Find the internal resistance of the cell(a) 1.2 Ω (b) 1.3 Ω (c) 1.1 Ω(d) 1.4 Ω
A 2μF capacitor is charged to 100 volt and then its plates are connected by a conducting wire. The heat produced is(a) 1 J (b) 0.1 J (c) 0.01 J(d) 0.001 J
Two uniform solid spheres having unequal masses and unequal radii are released from rest from the same height on a rough incline. If the spheres roll without slipping:
A semiconductor is a material with a small but non-zero band gap that behaves as an insulator at absolute zero but allows thermal excitation of electrons into its ____________ at temperatures that are below its melting point.
In two positive charges $q_2$ and $q_3$ fixed along the y axis, exert a net electric force in the $+x$ direction on a charge $q_1$ fixed along the $x$ axis. If a positive charge $Q$ is added at $(x, 0),$ the force on $q_{1.}$
→Metallic solids are always opaque because(a) Solids effect the incident light (b) Incident light is readily absorbed by the free electron in a metal(c) Incident light is scattered by solid molecules(d) Energy band traps the incident light
The reading of voltmeter and ammeter in the following figure will respectively be:
A study of binary stars is most helpful in(a) Finding their distances(b) Finding their temperature(c) Finding their masses(d) Verifying Newton's force law of gravitation
Assuming that universe is expanding, if the spectrum of light coming from a star which is going away from earth is tested, then in the wavelength of light(a) There will be no change(b) The spectrum will move to infrared region(c) The spectrum will seems to shift to ultraviolet side(d) None of the above