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PhysicsEMI/ACSelf and mutual inductorEasy2 minPYQ_2020

PhysicsEasysingle choice

A solenoid has $2000$ turns wound over a length of $0 .30 m$ . The area of its cross section is $1.2 \times 10^{- 3} m^{2}$ . Around its central section, a coil of $300$ turns is wound. If an initial current of $2 A$ in the solenoid is reversed in $0 .25 s$ , then the emf induced in the coil is equal to

Options:

Answer:

Solution:

$E m f = \frac{M d i}{d t} = (\frac{μ_{0} N_{1} N_{2} A}{l}) \frac{d i}{d t}$
$= \frac{4 π \times 10^{- 7} \times 2000 \times 300 \times 1.2 \times 10^{- 3} (4)}{0.3 \times 0.25}$

$= 4.8 \times 10^{- 2}$ V

Stream:JEESubject:PhysicsTopic:EMI/ACSubtopic:Self and mutual inductor

⏱ 2mℹ️ Source: PYQ_2020

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