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MOVING CHARGES AND MAGNETISM-14
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JEE Advanced Physics Syllabus can be referred by the IIT aspirants to get a detailed list of all topics that are important in cracking the entrance examination. JEE Advanced syllabus for Physics has been designed in such a way that it offers very practical and application-based learning to further make it easier for students to understand every concept or topic by correlating it with day-to-day experiences. In comparison to the other two subjects, the syllabus of JEE Advanced for physics is developed in such a way so as to test the deep understanding and application of concepts.

Q1. A particle of mass 2×10^(-5) kg moves horizontally between two horizontal plates of a charged parallel plate capacitor between which there is an electric field of 200 NC^(-1) acting upward. A magnetic induction of 2.0 T is applied at right angles to the electric field in a direction normal to both B< and v<. if g is 9.8ms^(-2) and the charge on the particle is 10^(-6) C, then find the velocity of charge particle so that it continuous to move horizontally


  •    2 ms^(-1)
  •   20 ms^(-1)
  •   0.2 ms^(-1)
  •   100ms^(-1)
Solution









Q2.In a region of space, a uniform magnetic filed B exists in the x direction. An electron is fired from the origin with its initial velocity u making an angle α with the y direction in the yz plane. In the subsequent motion of the electron.



  •  y-coordinate of the electron will never be negative


  •   z-coordinate of the electron will never be negative


  •   x-coordinate of the electron will never be negative


  •   Trajectory of the electron would be helical


Solution











Q3. A charged particle of mass 10^(-3) kg and charge 10^(-5)C enters a magnetic field of induction 1 T. ifg=10 ms^(-2), for what value of velocity will it pass straight through the field without deflection?





  •   10^(-3) ms^(-1)


  •  10^(3) ms^(-1)


  •  10^(6) ms^(-1)


  •  1 ms^(-1)


Solution











Q4. A circular loop is kept in that vertical plane which contains the north-south direction. It carries a current that is toward north at the topmost point. Let A be a point on the axis of the circle to the east of it and B a point on this axis to the west of it. The magnetic field due to the loop
  •   Is towards east at A and toward west at B
  •   Is towards west at A and toward east at B
  •   Is towards east at both A and B
  •   Is towards west at both A and B
Solution










Q5.  A rectangular loop carrying a current i is situated near a long straight wire such that the wire is parallel to one of the sides of the loop and is in the plane of the loop. If steady current I is established in the wire as shown in the figure below, the loop will

  •  Rotate about an axis parallel to the wire
  •  Move away from the wire
  •  Move toward the wire
  •  Remain stationary
Solution
 










Q6. A loop carrying current I lies in the x-y plane as shown in the figure. The unit vector k ̂ is coming out of the plane of the paper. The magnetic moment of the current loop is


  •  a^2 Ik ̂
  •   (π/2+1) a^2 Ik ̂
  • -(π/2+1) a^2 Ik ̂
  •  (2π+1) a^2 Uk ̂
Solution











Q7.A current of 1/(4π) ampere is flowing in a long straight conductor. The line integral of magnetic induction around a closed path enclosing the current carrying conductor is

  •   10^(-7) Wbm^(-1)
  •   4π×10^(-7) Wbm^(-1)
  •   16π^2×10^(-7) Wbm^(-1)
  •   zero
Solution










Q8.An electron is launched with velocity v vector in a uniform magnetic field B vector. The angle θ between v and B lies between 0 and π/2. Its velocity vector v vector returns to its initial value in a time interval of
  •   2πm/eBAlong positive y-axis
  •   (2×2πm)/eB
  •  πm/eB
  •  Depends upon angle between v vector and B vector
Solution









Q9.A current i is uniformly distributed over the cross section of a long hollow cylindrical wire of inner radius R_1 and outer radius R_2. Magnetic field B varies with distance r from the axis of the cylinder as



  •  

  •  

  •  

  •  

Solution











Q10. A current I flows along the length of an infinitely long, straight, thin walled pipe. Then
  •   ̂The magnetic field at all points inside the pipe is same, but not zero
  •  The magnetic field at any point inside the pipe is zero
  •  The magnetic field is zero only on the axis of the pipe
  • The magnetic field is different at different points inside the pipe
Solution







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