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in Physics by (122k points)
एक आवेशित गोल गेंद के अन्दर विद्युत विभव `phi=ar^(2) + b ` द्वारा दिया जाता है . जहाँ r केन्द्र से दुरी तथा a व् b नियतांक है |तब गेंद के अन्दर आवेश घनत्व है -
A. `- 24pia in_(0)r`
B. `-6pi a in_(0)r `
C. `- 24pi a in_(0)`
D. `- 6a in_(0)`

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