Magnetic force does no work: speed and kinetic energy stay the same

1. A.
   1
2. B.
   Infinite
3. C.
   Zero
4. D.
   -1

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1. A.
   Both (a) and (R) are true and (R) is the correct explanation of (a)
2. B.
   Both (a) and (R) are true but (R) is NOT the correct explanation of $(a)$
3. C.
   (a) is true but (R) is false
4. D.
   (a) is false but (R) is true.

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1. A.
   Both Statement I and Statement II are correct.
2. B.
   Both Statement I and Statement II are incorrect.
3. C.
   Statement I is correct but Statement II is incorrect.
4. D.
   Statement I is incorrect but Statement II is correct.

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