1.

If E and B are the magnitudes of electric and magnetic field respectively in some region of space, then the possibilities for which a charged particle may move in that space with a uniform velocity of magnitude v are

Answer»

E= vB
`E ne 0, B= 0`
`E=0, B ne 0`
`E ne 0, B ne 0`

Solution :Option (a): E= 0 so no ELECTROSTATIC force. `B ne 0`, but if `vec(B)` is parallel or ANTIPARALLEL to `vec(v)`, then magnetic force is also zero. Option (b) : ELECTRIC field will apply force so VELOCITY will change in this case.
Option (c ): Force DUE to electric field and magnetic field can balance each other. `q vec(E )+ q(vec(v) xx vec(B))= 0`
Option (d): Both the fields are absent so there is no force.


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