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Magnetic Effect Of Current And Magnetism Quiz-4

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. 


Q31. The lines of force due to earth’s horizontal component of magnetic field are
  •  Parallel straight lines
  •  Concentric circles
  •  Elliptical
  •  Parabolic
Solution
Parallel straight lines

Q32.The coil in a tangent galvanometer is 16 cm in radius. If a current of 20 mA is to produce a deflection of 45° then the number of turns wound on it, is (Take horizontal component of earth’s magnetic field=0.36×10-4 T and μ0=4π×10-7 Wb A-1 m-1
  •  229
  •  458
  •  689
  •  916
Solution
                          



Q33.  A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It
  •   Will become rigid showing no movement
  •  Will stay in any position
  •  Will stay in north-south direction only
  •  Will stay in east-west direction only
Solution
Since magnetic field is in vertical direction and needle is free to rotate in horizontal plane only so magnetic force can not rotate the needle in horizontal plane so needle can stay in any position

Q34. The magnetic moment of a diamagnetic atom is
  •  Much greater than one
  •  1
  •  Between zero and one
  •  Equal to Zero
Solution
Equal to zero

Q35.A tangent galvanometer has a coil with 50 turns and radius equal to 4 cm. A current of 0.1 A is passing through it. The plane of thecoil is set parallel to the earth’s magnetic meridian. If the value of the earth’s horizontal component of the magnetic field is 7×10-5 tesla and μ0=4π×10-7 weber/amp×m, then the deflection in the galvanometer needle will be
  •  45°
  •  48.2°
  •  50.7°
  •  52.7°
Solution
                              


Q36. With a standard rectangular bar magnet of length (l), breadth (b; b<<l) and magnetic moment M, the time period of the magnet in vibration magnetometer is 4 s. If the magnet is cut normal to its length into four equal pieces, the time period (in second) with one of the pieces
  •  16
  • 2
  •  1
  •  1/4
Solution
                             



Q37.A wire of length L metre carrying current i, ampere is bent in the form of a circle. What is the magnitude of magnetic of magnetic dipole moment?
  •  iL2/4π
  •  i2 L2/4π
  •  i2 L/8π
  •  iL2/8π
Solution
                                  





Q38.Two tangent galvanometer having coils of the same radius are connected in series. A current flowing in them produces of 60° and 45° respectively. The ratio of the number of turns in the coil is
  •  4/3
  •  (√3+1)/1
  •  (√3+1)/(√3-1)
  •  √3/1
Solution
                               



Q39.Two identical bar magnets with a length 10 cm and weight 50 g-weight are arranged freely with their poles facing in a inverted vertical glass tube. The upper magnet hangs in the air above the lower one so that the distance between the nearest pole of the magnet is 3mm. Pole strength of the poles of each magnet will be
                                                     

  •  6.64 amp×m
  •  2 amp×m
  •  10.25 amp×m
  •  None of these
Solution
                        



Q40. The magnetized wire of moment M and length l is bent in the form of semicircle of radius r. Then its magnetic moment is
  •  2M/π
  •  2M
  •  M/π
  • Zero
Solution
                               


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