JEE Questions for Physics Magnetism And Matter Quiz 8 - MCQExams.com

A bar magnet of magnetic moment 200A-m2 is suspended in a magnetic field of intensity 0.25N/A-m. The couple required to deflect it through 30° is
  • 50 N-m
  • 25 N-m
  • 20 N-m
  • 15 N-m
Two similar bar magnets P and Q, each of magnetic moment M, are taken, If P is cut along its axial line and Q is cut along its equatorial line, all the four pieces obtained have
  • Equal pole strength
  • Magnetic moment M/4
  • Magnetic moment M/2
  • Magnetic moment M
There is no couple acting when two bar magnets are placed coaxially separated by a distance because
  • There are no forces on the poles
  • The forces are parallel and their lines of action do not
  • The forces are perpendicular to each other
  • The forces act along the same line
The ultimate individual unit of magnetism in any magnet is called
  • North pole
  • South pole
  • Dipole
  • Quadrupole
The magnetic field lines due to a bar magnet are correctly shown in

  • Physics-Magnetism and Matter-78120.png
  • 2)
    Physics-Magnetism and Matter-78121.png

  • Physics-Magnetism and Matter-78122.png

  • Physics-Magnetism and Matter-78123.png
Intensity of magnetic field due to earth at a point inside a hollow steel box is
  • Less than outside
  • More than outside
  • Same
  • Zero
Earth\'s magnetic field always has a horizontal component except at or horizontal component of earth\'s magnetic field remains zero at
  • Equator
  • Magnetic poles
  • A latitude of 60°
  • An altitude of 60°
A dip needle in a plane perpendicular to magnetic meridian will remain
  • Vertical
  • Horizontal
  • In any direction
  • At an angle of dip to the horizontal
At magnetic poles of earth, angle of dip is
  • Zero
  • 45°
  • 90°
  • 180°
The correct relation is
[Where BH = Horizontal component of earth\'s magnetic field; BV = Vertical component of earth\'s magnetic field and B = Total intensity of earth\'s magnetic field]

  • Physics-Magnetism and Matter-78125.png
  • 2)
    Physics-Magnetism and Matter-78126.png

  • Physics-Magnetism and Matter-78127.png

  • Physics-Magnetism and Matter-78128.png
The vertical component of earth\'s magnetic field is zero at or the earth\'s magnetic field always has a vertical component except at the
  • Magnetic poles
  • Geographical poles
  • Every place
  • Magnetic equator
The lines of force due to earth\'s horizontal component of magnetic field are
  • Parallel straight lines
  • Concentric circles
  • Elliptical
  • Parabolic
If the angles of dip at two places are 30° and 45° respectively, then the ratio of horizontal components of earth\'s magnetic field at the two places will be

  • Physics-Magnetism and Matter-78130.png
  • 2)
    Physics-Magnetism and Matter-78131.png

  • Physics-Magnetism and Matter-78132.png

  • Physics-Magnetism and Matter-78133.png
A bar magnet is 10 cm long, and is kept with its north (N)– pole pointing north. A neutral point is formed at a distance of 15 cm from each pole. Given the horizontal component of earth\'s field to be 0.4 gauss, the pole strength of the magnet is
  • 9 A–m
  • 6.75 A–m
  • 27 A–m
  • 1.35 A–m
The angle of dip at a place is 40.6° and the intensity of the vertical component of the earth\'s magnetic field V = 6 × 10–5 tesla. The total intensity of the earth\'s megnetic field (I) at this place is
  • 7 × 10–5 tesla
  • 6 × 10–5 tesla
  • 5 × 10–5 tesla
  • 9.2 × 10–5 tesla
If magnetic lines of force are drawn by keeping magnet vertical, then number of neutral points will be
  • One
  • Two
  • Four
  • Five
At the magnetic poles of the earth, a compass needle will be
  • Vertical
  • Bent slightly
  • Horizontal
  • Inclined at 45° to the horizontal
The angle of dip at the magnetic equator is
  • 0°
  • 45°
  • 30°
  • 90°
The line on the earth\'s surface joining the points where the field is horizontal is
  • Magnetic meridian
  • Magnetic axis
  • Magnetic line
  • Magnetic equator
Let V and H be the vertical and horizontal component of earth\'s magnetic field at any point on earth. Near the north pole
  • V >> H
  • V << H
  • V = H
  • V = H = 0
The angle of dip at a place on the earth gives
  • The horizontal component of the earth's magnetic field
  • The location of the geographic meridian
  • The vertical component of the earth's field
  • The direction of the earth's magnetic field
At the magnetic north pole of the earth, the value of horizontal component of earth\'s magnetic field and angle of dip are, respectively
  • Zero, maximum
  • Maximum, minimum
  • Maximum, maximum
  • Minimum, minimum
At a place, the magnitudes of the horizontal component and total intensity of the magnetic field of the field of the earth are 0.3 and 0.6 oersted respectively. The value of the angle of dip at this place will be
  • 60°
  • 45°
  • 30°
  • 0°
A dip circle is at right angle to the magnetic meridian. What will be the apparent dip?
  • 0°
  • 30°
  • 60°
  • 90°
A bar magnet is placed north-south with its north pole due north. The points of zero magnetic field will be in which direction from the centre of the magnet
  • North and south
  • East and west
  • North-east and south-west
  • North-west and south-east
Magnetic meridian is a
  • Point
  • Horizontal plane
  • Vertical plane
  • Line along N-S
The earth\'s magnetic field at a certain place has a horizontal component 0.3 gauss and the total strength 0.5 gauss. The angle of dip is

  • Physics-Magnetism and Matter-78139.png
  • 2)
    Physics-Magnetism and Matter-78140.png

  • Physics-Magnetism and Matter-78141.png

  • Physics-Magnetism and Matter-78142.png
The value of the horizontal component of the earth\'s magnetic field and angle of dip are 1.8 × 10–5 Weber/m 2 and 30° respectively at some place. The total intensity of earth\'s magnetic field at that place will be
  • 2.08 × 10–5 Weber/m 2
  • 3.67 × 10–5 Weber/m 2
  • 3.18 × 10–5 weber/m 2
  • 5.0 × 10–5 weber/m 2
When the N-pole of a bar magnet points towards the south and S-pole towards the north, the null points are at the
  • Magnetic axis
  • Magnetic centre
  • Perpendicular divider of magnetic axis
  • N and S poles
Lines which represent places of constant angle of dip are called
  • Isobaric lines
  • Isogonic lines
  • Isoclinic lines
  • Isodynamic lines
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