MAGNETIC EFFECT OF CURRENT: MCQ ON MAGNETIC MATERIALS SET 2

 

Q1 Magnetic field intensity at a point on the axial line of the magnet various with distance 'r' of the point from the center of the bar magnet as

  • (a) `r^{1}`
  • (b) `r^{2}`
  • (c) `r^{-1}`
  • (d) `r^{-3}`

  • (d) `r^{-3}`

Q2 Suppose magnetic field intensity at a distance r from the center of a short bar magnet on the axial live is B. Then magnetic field intensity at a distance r from the bisector of the bar magnet is.

  • a) B
  • b) 2B
  • c) B/2
  • d) None of these 

  • c) B/2

Q3  A wire of length l has a magnetic moment m. If it is bent into a semi-circular arc, its new magnetic moment is:

  • a) m/l
  • b) 2M/л
  • c) m
  • d) M

  • b) 2M/л

Q4 If magnetic length of a bar magnet is 'x' and the geometrical length of the bar magnet is 'y', then:

  • a) x = y
  • b) x > y
  • c) x < y
  • d) None of these

  • c) x < y

Q5 SI units of magnetic dipole moment of a bar magnet are

  • a) A`m^{2}`
  • b) A`m^{-1}`
  • c) A`m^{-2}`
  • d) `A^{-1}`m

  • a) A`m^{2}`

Q6 The force between two magnetic poles is F. If the distance between  the poles and pole strengths of each pole are doubled, then the force experienced is:

  • a) F
  • b) F/4
  • c) 2F
  • d) F/2

  • a) F

Q7  The dimensions of magnetic dipole moment are `M^{0}L^{2}T^{0}`I

  • a) True
  • b) False 


  • a) True

Q8 What is the net magnetic flux through a closed surface? 


  • a) Positive
  • b) Negative
  • c) Zero
  • d) Depends on the nature of the surface

  • c) Zero

Q9.  ‘X’ is the product of the pole strength of either magnetic pole and the magnetic length of the magnetic dipole. Identify X.

  • a) Magnetic dipole
  • b) Magnetic dipole moment
  • c) Magnetic pole strength
  • d) Magnetic dipole length

  • b) Magnetic dipole moment

Q10 What is the torque exerted by a bar magnet on itself due to its field?

  • a) Maximum
  • b) Zero
  • c) Minimum
  • d) Depends on the direction of the magnetic field

  • b) Zero, 
  • A bar magnet does not exert a force or torque on itself due to its field. But an element of a current-carrying conductor experiences forces due to another element of the conductor. So, the torque exerted by a bar magnet on itself is zero.

  

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