| Directions (Q. Nos. 27): For the following questions. Choose the correct answers from the codes [a], [b], [c] and [d] defined as follows. |
| Statement I If we consider an inertial frame S in which two identical charges move towards each other with same speed, then it is impossible to find another inertial frame S' in which only one of the fields either electric or magnetic would be observed. |
| Statement II For above described situation, it is impossible to have an inertial frame S' in which both the charges are at rest. |
A) Statement I is true. Statement II is also true and Statement II is the correct explanation of Statement I.
B) Statement I is true. Statement II is also true and Statement II is not the correct explanation of Statement I.
C) Statement I is true. Statement II is false.
D) Statement I is false. Statement II is true.
Correct Answer: B
Solution :
The decomposition of electromagnetic field into its component electric and magnetic fields depends upon the frame of reference. If we are able to find a frame of reference in which both charges are at rest, then in this frame of reference the electromagnetic field is purely electrical in nature. And in above case, there is no possibility that in any frame that both charges are all rest and hence, it is not possible that only one of the fields is existing.
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