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Question
The magnetic field at the centre O of the following current loop is
Options
`(mu_circ "I")/(4"r")⊗`
`(mu_circ "I")/(4"r")⊙`
`(mu_circ "I")/(2"r")⊗`
`(mu_circ "I")/(2"r")⊙`
Solution
`(mu_circ "I")/(4"r")⊗`
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