Question:
The figure shows a liquid of given density flowing steadily in horizontal tube of varying cross-section. Cross sectional areas at A is 1.5 cm² , and B is 25 mm² , if the speed of liquid at B is 60 cm/s then (PA – PB) is : (Given PA and PB are liquid pressures at A and B points)A and B are on the axis of tube 
(1) 175 Pa 
(2) 27 Pa 
(3) 135 Pa 
(4) 36 Pa
                                                      JEE-2024       
Solution:                
The figure shows a liquid of given density flowing steadily in horizontal tube of varying cross-section. Cross sectional areas at A is 1.5 cm² , and B is 25 mm² , if the speed of liquid at B is 60 cm/s then (PA – PB) is : (Given PA and PB are liquid pressures at A and B points)A and B are on the axis of tube (1) 175 Pa (2) 27 Pa (3) 135 Pa (4) 36 Pa JEE-2024

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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