Consider the motion of a positive point charge in a region where there are simultaneous uniform electric and magnetic fields 0 ˆ E E j = ur and 0 ˆ B B j. = r At time t = 0, this charge has velocity v r in the x-y plane, making an angle ? with the x-axis. Which of the following option(s) is (are) correct for time t > 0? (A) If 0 , ? = ° the charge moves in a circular path in the x-z plane. (B) If 0 , ? = ° the charge undergoes helical motion with constant pitch along the y-axis. (C) If 10 , ? = ° the charge undergoes helical motion with its pitch increasing with time, along the y-axis. (D) If 90 , ? = ° the charge undergoes linear but accelerated motion along the y-axis.

in a physics laboratory a block x is balanced by a block Y of mass 200 kg,each are suspended from a balance of equal lever arms .the scale pan on X is at a height.H1=2 cm ,where as scale pan on Y is at height 1 cm above the floor.the error in weighing is (in gram)

consider the figure of a single riveted lap joint as follows

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cyclic heat engine operates between. temperature of 30 C. What is the least rate of heat rejection per kW net output of an engine. source temperature of 800 C and sink

 

 

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