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Physics - EMI/AC Question with Solution | TestHub

PhysicsEMI/ACL-R circuitHard2 minQB

PhysicsHardsingle choice

At $t = 0$ , switch is closed. At $t = τ$ sec core is dragged out suddenly by an external agent. Find the value of current just before and just after pulling the core. Resistance of the circuit is very small and can be neglected.

Options:

Answer:

Solution:

$Before - L_{0} \frac{di}{dt} + ε = 0 i = \frac{ε t}{L _{0}} i_{before} = \frac{ε τ}{L _{0}} L_{0} = \frac{ε t}{L _{0}} = \frac{L _{0}}{μ _{r}} \cdot i i_{after} = μ_{r} \cdot \frac{ε t}{L _{0}}$

Stream:JEESubject:PhysicsTopic:EMI/ACSubtopic:L-R circuit

⏱ 2mℹ️ Source: QB

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