Column-I shows the state of motion of a charge particle. Column-II shows the possible combination of electric field and magnetic filed under which the path in Column-I is possible. Match Appropriately
Column -I | Column -II | ||
(A) | Charge at rest experiences a force. | (I) | |
(B) | A charge in motion goes undeviated with same velocity. | (II) | |
(C) | A charge in motion goes undeviated with varying speed. | (III) | |
(D) | A charged particle undergoes helical motion | (IV) |
Text Solution
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If a charged particle at rest experiences a force, then this should be electrostatic force. So electric field should be present, magnetic field may or may not present.
This possible if (i) both fields are zero (ii) both fields are not zero and their forces balance (iii) 
and velocity is parallel to magnetic field.
But if only E is there, then velocity cannot remain same.
Speed can vary only if electric field is present. Particle will go undeviated with varying speed if 
and B all are in same direction. B may also be zero.
For helical path, B should be present, E may or may not be.
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