# Recent questions tagged magnetic

What arc the errors occurring in measuring devices due to stray magnetic field and temp '? Explain how to compensate them.

Explain magnetic effect employed in measuring instrument.

Define the following terms: i) Magnetic flux density, ii) Reluctance, iii) Magneto-motive force, iv) Permeance.

Derive an expression for energy stored in a magnetic field .

What is magnetic hysteresis? What is the cause of hysteresis?

Define magnetic lines of force. Also draw and show magnetic lines of force of a bar type magnet.

Classify magnetic materials and explain in brief.

State and explain Ohm's law for magnetic circuit.

Compare electric and magnetic circuit.

Define magnetic circuit. Draw simple series magnetic circuit.

Give the relation between magnetic field strength, magnetic flux density and permeability.

Define magnetic flux density and state its formula.

Define magnetic field strength and state its unit.

Define magnetic lines of force. Show the magnetic lines of force for bar type magnet.

The magnetic susceptibility of paramagnetic material is: A) Less than zero B) Less than one but positive C) Greater than one D) Equal to zero

Magnetic circuit breakers use _________ A) Permanent magnets B) Earth magnets C) Solenoid D) All the above

Which of the following is a unit of magnetic flux? A) Weber B) Maxwell C) Both A and B D) None of these

What is the SI unit for magnetic reluctance? A) Ampere B) Ampere-turns per weber C) Henry D) None of these

Which of the following laws relates the magnetic field to the magnitude, direction, length, and proximity of the electric current? A) Lenz’s law B) Faraday’s law C) Biot–Savart law D) None of these

The magnetic permeability of a diamagnet is _________ A) More than that of vacuum B) Same as that of vacuum C) Less than that of vacuum D) 3.14 times that of vacuum

The magnetic neutral plane shifts in a dc machine (A) in the direction of motion of motor (B) in the direction of motion of generator (C) due to increase in the field flux (D) cause reduction of flash over between commutator segments

Which of the following statements is not characteristic of a static magnetic field? (A) It is solenoidal. (B) It is conservative. (C) It has no sinks or sources. (D) Flux lines are always closed.

The property of a material which opposes the creation of magnetic flux in it is known as?

In a magnetic material hysteresis loss takes place primarily due to?

A material for good magnetic memory should have?

Those magnetic materials are best suited for making armature and transformer cores which have____permeability and_______hystersis loss.

Permeability in a magnetic circuit corresponds to______ in an electric circuit.

The unit of magnetic flux is?

An air gap is usually inserted in magnetic circuits to?

The path of magnetic flux in a transformer should have?

The magnetic factor required to reduce the residual magnetization zero is called?

Define magnetic susceptibility.