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Magnetism and Magnetic Properties

Questions covering magnetic fields, earth's magnetism, magnetic domains, compass navigation, and properties of magnets at various levels including advanced calculations and theory.

21 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

A DMM is arragned at the magnetic pole of earth in $\tan{A}$ position. If a bar magnet is placed at some distance from the needle, deflection is

  1. ${0}^{o}$
  2. ${90}^{o}$
  3. ${45}^{o}$
  4. ${180}^{o}$
Question 2 Multiple Choice (Single Answer)

The needle of a dip circle shows an apparent dip of $45^o$ at a place and $60^o$ when the circle is rotated through $90^o$. The true dip is

  1. $cos^{-1} \left (\cfrac 1{\sqrt 3}\right)$
  2. $cos^{-1} \left (\cfrac {\sqrt 3}{2}\right)$
  3. <span>$cos^{-1} \left (\cfrac {1}{2}\right)$</span>
  4. <span>$cos^{-1} \left (\cfrac { 1}{\sqrt2}\right)$</span>
Question 3 Multiple Choice (Single Answer)

If earth's magnetic field $B _H$, if the frequency of oscillation of a magnetic needle is n, then -

  1. $ n \propto B _H$
  2. $ n^2 \propto B _H$
  3. $ n \propto B _H^2$
  4. $n^2 \propto \frac{1}{B _H}$
Question 4 Multiple Choice (Single Answer)

An aeroplane, in which the distance between the tips of the wings is $50 m$, is flying horizontally with a speed of $360$ km/hour, over a place where the vertical component of earth's magnetic field is $2.0 \times 10^{-4} \ tesla$ . The potential difference between the tips of the wings would be

  1. $0.1 V$
  2. $0.5 V$
  3. $0.2 V$
  4. $1.0 V$
Question 5 Multiple Choice (Single Answer)

In an uniform field the magnetic needle completes 10 oscillations in 92seconds. When a small magnet is placed in the magnetic meridian 10cm due north of needle with north pole towards south completes 15 oscillations in 69seconds. The magnetic moment of magnet ($B _H =0.3 \ G$) is

  1. $4.5 \ A m^2$
  2. $0.45 \ A m^2$
  3. $0.75 \ A m^2$
  4. $0.225 \ A m^2$
Question 6 Multiple Choice (Single Answer)

A magnetic needle is kept in a nonuniform magnetic field. It

  1. may experience a force but certainly not a torque
  2. may experience a torque but certainly not a force
  3. may experience both a torque as well as force
  4. will certainly experience neither a force not a torque
Question 7 Multiple Choice (Single Answer)

The needle of a dip circle when place at a geomagnetic pole stays along

  1. south-north direction only
  2. east-west direction only
  3. vertical direction
  4. horizontal direction
Question 8 Multiple Choice (Single Answer)

Which of the following helps detecting the presence of magnetic field at a point ?

  1. a strong magnet
  2. a solenoid
  3. a compass needle
  4. a current carrying wire
Question 9 Multiple Choice (Single Answer)

What kind of magnet  is used in a magnetic compass ?

  1. electromagnet
  2. permanent magnet
  3. temporary magnet
  4. none of the above
Question 10 Multiple Choice (Single Answer)

What is the circular enclosure that the magnetic compass is placed in ?

  1. iron case
  2. stainless steel case
  3. aluminium case
  4. nickel case
Question 11 Multiple Choice (Single Answer)

A device used by the sailors to find the direction in which their ship is moving is called .................

  1. horse shoe
  2. curve
  3. magnetic field
  4. magnetic needle
Question 12 Multiple Choice (Single Answer)

State whether true or false:

A tracing needle is used by the sailor for navigation.  

  1. True
  2. False
Question 13 Multiple Choice (Single Answer)

The presence of magnetic field at a point can be detected by

  1. <span>ammeter&nbsp;</span>
  2. galvanometer
  3. <span>a compass needle</span>
  4. strong magnet
Question 14 Multiple Choice (Single Answer)

The magnetic compass is not useful for navigation near the magnetic poles, since

  1. $R=0$
  2. $V=0$
  3. $H=0$
  4. $\theta={0}^{o}$
Question 15 Multiple Choice (Single Answer)

Two parallel conductors are separated by 5cm. They carry 6A and 2A in the same direction. Between them the location from first at which magnetic needle lies along $B _H$ is

  1. 1.25 cm
  2. 3.75 cm
  3. 2.5 cm
  4. no point exist
Question 16 Multiple Choice (Single Answer)

A magnetic needle oscillates in a horizontal plane with a period $T$ at a place where the angle of dip is $60^0$. When the same needle is made to oscillate in a vertical plane coinciding with the magnetic meridian, its period will be 

  1. $\frac{T}{\sqrt 2}$
  2. T
  3. 2T
  4. 6T
Question 17 Multiple Choice (Single Answer)

When a current of $1$ ampere is passed in a coil lying in the magnetic meridian then a magnetic needle at its centre gives some deflection. If the current in the coil is increased to $\sqrt8$ ampere then at what distance from the centre of the coil will the deflection of needle remains underchanged?

  1. $2R$
  2. $4R$
  3. $8R$
  4. $R$
Question 18 Multiple Choice (Single Answer)

The magnetic fields of atoms in a material are grouped together and aligned to form _________.

  1. Strong magnetic fields
  2. An area of magnetic field
  3. A region called magnetic domain
  4. A bar magnet
Question 19 Multiple Choice (Single Answer)

The smallest magnet available is ___________.

  1. a bar magnet with an area of $1 mm^2$
  2. a spinning electron
  3. a magnetic dipole
  4. a molecule or atom with a magnetic dipole
Question 20 Multiple Choice (Single Answer)

The magnetic domains of an unmagnetised object are found ___________.

  1. Parallel to each other
  2. Perpendicular to each other
  3. Pointing towards south
  4. Pointing in different direction
Question 21 Multiple Choice (Single Answer)

The primary origin of magnetism lies in the

  1. atomic current and intrinsic spin of electrons.
  2. polar and non polar nature of molecules.
  3. pauli exclusion principle.
  4. electronegative nature of materials
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