Column- I gives situations involving a charged particle which may be realized under the condition given in column-II match the situations in column-I with the condition in column-II.
Column-I | Column-II |
(i) Increase in speed of a changed particle space | [A] Electric field uniform in space and constant in time |
(ii) Exert a force on an electron initially at rest | [B] Magnetic field uniform in space and constant in time |
(iii) Move a charged particle in a circle with uniform speed | [C] Magnetic field uniform in space by varying with time |
(iv) Accelerate a moving charged particle | [D] Magnetic field non- uniform in space but constant with time |
Text Solution
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Ans.
(i) [A],[C]
(ii) [A],[C]
(iii) [B],[D]
(iv)[A],[B],[C],[D]
Sol.
Speed of charged particle can not be changed by magnetic force because magnetic force does no work on charged particle. Only electric field in case (P) and induced electric field in case (R) can change speed of charged particle
Magnetic field can not exert force on charged particle at rest. Only electric field in case (R) can exert force on charge initially at rest. In case (R) after the charge starts moving even the magnetic field can exert force on charge.
A charged particle can move in a circle with uniform speed due to uniform and constant magnetic field in case. Even within a region of non uniform magnetic field, at all point on a circle field may be uniform for example on any circle coaxial with a current carrying ring.
A moving charged particle is accelerated by electric field and also accelerated by magnetic field (provided 
is not parallel to 
).
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