An electron is moving along the positive x-axis. If
the uniform magnetic field is applied parallel to the
negative z-axis.
A. The electron will experience magnetic force
along positive y-axis 
 B. The electron will experience magnetic force
along negative y-axis 
 C. The electron will not experience any force in
magnetic field
 D. The electron will continue to move along the
positive x-axis
 E. The electron will move along circular path in
magnetic field 
Choose the correct answer from the options given
below Option :
(1) B and E only 
(2) A and E only 
(3) C and D only
(4) B and D only                                                                                                                JEE-2024   
Solution:                
An electron is moving along the positive x-axis. If the uniform magnetic field is applied parallel to the negative z-axis. A. The electron will experience magnetic force along positive y-axis B. The electron will experience magnetic force along negative y-axis C. The electron will not experience any force in magnetic field D. The electron will continue to move along the positive x-axis E. The electron will move along circular path in magnetic field Choose the correct answer from the options given below Option : (1) B and E only (2) A and E only (3) C and D only (4) B and D only

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The magnetic field at the centre of a wire loop formed by two semi circular wires of radii R1 = 2 πm and R2 = 4π m carrying current I = 4A as per figure  given below is  a × 10^–7 T. The value of a is  ______. (Centre O is common for all segments)           

                                                                      JEE-2024