Physics-
General
Easy
Question
An electron moving with a speed u along the positive x–axis at y = 0 enters a region of uniform magnetic field 
which exists to the right of y–axis. The electron exist from the region after some time with the speed v at co–ordinate y, then :
- v > u, y < 0
- v = u, y > 0
- v > u, y > 0
- v = u, y < 0
The correct answer is: v = u, y < 0
Magnetic force does not change the speed of charged particle. Hence, v=u. Further magnetic field on the electron in the given condition is along negative y-axis in the starting Or it describes a circular path in clockwise direction. Hence, when it exits from the field, y < 0
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Two oxides of Metal contain 27.6% and 30% oxygen respectively. If the formula of first oxide is 
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chemistry-General
