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द्रव्यमान m आवेश q तथा गतिज ऊर्जा K का एक कण एकसमान चुंबकीय क्षेत्र B में लंबवत प्रवेश करता है। 3 सेकण्ड, के पश्चात् कण की गतिज ऊर्जा होगी:
A. 3K
B. 2K
C. K
D. 4K

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Correct Answer - C
एकसमान चुंबकीय क्षेत्र में कण की गतिज ऊर्जा अपरिवर्तित रहती है।

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