MHT CET 2025 Physics question
A coil is wound on a core of rectangular cross-section. If all the linear dimensions of core are increased by a factor 3 and number of turns per unit length of coil remains same, the self-inductance increases by a factor
Answer: (C)
Solution
Self-inductance of a coil on a core is , where is the cross-section area and the length. If all linear dimensions are tripled, and . Taking the total number of turns to be unchanged (the only reading of the question for which one of the given
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