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The polarity of 'dees’ should be changed...

The polarity of 'dees’ should be changed, when the charge completes one half circle. Why?

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To accelerate the particle again in the electric field and is phase with its motion.
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NEW JOYTHI PUBLICATION-MOVING CHARGES AND MAGNETISM-EVALUATION QUESTIONS AND ANSWERS
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  2. What is the nature of the path inside the 'dee'?

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