A charged paricle goes undeflected in a region containing electric and magnetic field. It is possible that
A
` E = 0 , B = 0 `
B
` E = 0 , B != 0 `
C
` E != 0 , B = 0 `
D
` E != 0 , B ! = 0 `
Text Solution
Verified by Experts
The correct Answer is:
A, B, D
There is no change in velocity . IT can be possible when * Electric and magnetic fields are absent, i.e , `E = 0 , B = 0 ` * Or when electric and magnetic fields are present but force due to electric field is equal and opposite to the magnetic force, `( i.e. E!= 0, B!= 0)` . * Or when ` E = 0. B!= 0 ` is provided ` F = qvB sin theta = 0` ` sin theta = 0 , i.e, theta = 0 rArr v and B` are in the same direction .
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