1yes the ans shud be (b).
can any one tell me. wats the ans?
An electron is at rest in a region having uniform & constant magnetic field.The magnitude of the magnetic field is suddenly doubled keeping its direction same.After the sudden change,the magnetuc field is again uniform & constant.after the magnetic becoms double...(neglect gravity)
a)The electron continues o be at rest
b)The electron starts to move alpng a straight line
c) The electron moves along a circular part.
d)The electron moves alomg a helical path..
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18 Answers
1due to E field induced..the e wll begin to move...as it acquires some vel..magnetic force will start acting.....so spiral is the answer
11induced electric field.... ????????????
I can't see any time varying Mag.field !!!!
1i agree wit asish's concept....
so the direction of induced emf will oppose the change ie the emf induced will make pi angle with magnetic field... and elec moves from lower 2 higher potential.... therfore it is again it makes 00 wit B.. ie it moves in straight line for short time
106@wats in name: flux changes so, there is some induced emf for a fraction of time so there is some force on electron.. but since force acts for very small time it shud go in a straight path (b) ??
11one doubt........
" An electron is at rest in a region .... "
Is v = 0, or electron is in equilibrium (my ans. is rite in the 2nd case.i think so).