1.

A uniform electric field E is present horizontally along the paper throughout region but uniform magnetic field B_(0) is present horizontally (perpendicular to plane of paper in inward direction) right to the line AB as shown. A charge particle having charge q and mass m is projected vertically upward and crosses the line AB after time t_(0). Find the speed of projection if particle moves after t_(0) with constant velocity. (given qE = mg)

Answer»

`g t_(0)`
`2g t_(0)`
`(g t_(0))/(2)`
particle can't MOVE with CONSTANT VELOCITY after crossing AB

Solution :Charge is conserved.


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