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Magnetic Effect Of Current And Magnetism Quiz-5

Dear Readers,

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background. 


Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced. 



Q41. Among the following properties describing diamagnetism identify the property that is wrongly stated
  •  Diamagnetic material do not have permanent magnetic moment
  •  Diamagnetism is explained in terms of electromagnetic induction
  •  Diamagnetic materials have a small positive susceptibility
  •  The magnetic moment of individual electrons neutralize each other
Solution
Diamagnetic materials have negative susceptibility. Thus, (c) is wrongly stated.

Q42.A bar magnet of magnetic moment M and moment of inertia I is freely suspended such that the magnetic axial line is in the direction of magnetic meridian. If the magnet is displaced by a very small angle (θ), the angular acceleration is (Magnetic induction of earth’s horizontal field =BH)
  •  (MBH θ)/I
  •  (IBH θ)/M
  •  Mθ/(IBH )
  •  Iθ/(MBH )
Solution
                        



Q43.  A tangent galvanometer has a coil of 25 turns and a radius of 15 cm. The horizontal component of the earth’s magnetic field is 3×10-5T. The current required to produce a deflection of 45° in it is
  •  0.29 A
  •   0.14 A
  •  1.2 A
  •  3.6×10-5 A
Solution
                               


Q44. A magnet makes 40 oscillations per minute at a place having magnetic field intensity of 0.1×10-5 T. At another place, it takes 2.5 sec to complete one vibration. The value of earth’s horizontal field at that place is+
  •  0.25×10-6 T
  •  0.36×10-6 T
  •  0.66×10-8 T
  •  1.2×10-6 T
Solution
                                



Q45.Two identical magnetic dipoles of magnetic moment 2 Am2 are placed at a separation of 2 m with their axis perpendicular to each other in air. The resultant magnetic field at a mid-point between the dipoles is
  •  4√5 ×10-5 T
  •  2√5 ×10-5 T
  •  4√5 ×10-7 T
  •  2√5 ×10-7 T
Solution
                              

 


Q46. Two short magnets with pole strengths of 900 ab amp-cm and 100 ab-amp-cm are placed with their axes in the same vertical line, with similar poles facing each other. Each magnet has a length of 1 cm. When separation between the nearer poles is 1 cm, the weight of upper magnet is supported by the repulsive force between the magnets. If g=1000cms-2, then the mass of upper magnet is
  •  100 g
  •  55 g
  • 45 g
  •  77.5 g
Solution
                           



Q47.Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show
  •  Paramagnetism
  •  Anti-ferromagnetism
  •  No magnetic property
  •  Diamagnetism
Solution
If the temperature of a ferromagnetic material is raised above a certain critical value, called the Curie temperature, the exchange coupling ceases to be effective. Most such materials then become simply paramagnetic; that is, the dipoles still tend to align with an external field but much more weakly, and thermal agitation can now more easily disrupt the alignment.

Q48.To shield an instrument from external magnetic field, it is placed inside a cabin made of
  •  Wood
  •  Ebonite
  •  Iron
  •  Diamagnetic substance
Solution
Cabin must be made of iron, which has large permeability.

Q49.The basic magnetization curve for a ferromagnetic material is shown in figure. Then, the value of relative permeability is highest for the point
                                  

  •  P
  •  Q
  •  R
  •  S
Solution
                     

 


Q50. A small bar magnet A oscillates in a horizontal plane with a period T at a place where the angle of dip is 60°. When the same needle is made to oscillate in a vertical plane coinciding with the magnetic meridian, its period will be
  •  T/√2
  •  T
  •  √2T
  • 2T
Solution                 
                              

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