(B) The change in magnetic flux $\Delta \phi$ is given by $\Delta \phi = N A (B_2 - B_1)$.Given: $N = 100$,$A = 24\,cm^2 = 24 \times 10^{-4}\,m^2$,$R

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(B) The change in magnetic flux $\Delta \phi$ is given by $\Delta \phi = N A (B_2 - B_1)$.Given: $N = 100$,$A = 24\,cm^2 = 24 \times 10^{-4}\,m^2$,$R = 12\,\Omega$,$B_1 = 1.5\,T$,and $B_2 = -1.5\,T$.Thus,$\Delta \phi = 100 \times 24 \times 10^{-4} \times (-1.5 - 1.5) = 0.24 \times (-3) = -0.72\,Wb$.The induced charge $Q$ is given by $Q = \frac{|\Delta \phi|}{R}$.$Q = \frac{0.72}{12} = 0.06\,C$.Converting to $mC$: $0.06\,C = 60\,mC$.

Class 12 Physics Electromagnetic Induction Faraday's and Lenz's Law

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An insulated copper wire of $100$ turns is wrapped around a wooden cylindrical core of the cross-sectional area $24\,cm^2$. The two ends of the wire are connected to a resistor. The total resistance in the circuit is $12\,\Omega$. If an externally applied uniform magnetic field in the core along its axis changes from $1.5\,T$ in one direction to $1.5\,T$ in the opposite direction,the charge flowing through a point in the circuit during the change of magnetic field will be $.........\,mC$.

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Electromagnetic Induction

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Faraday's and Lenz's Law

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Discuss Faraday's experiment of two coils for the generation of electric current in a coil.

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Consider a magnet surrounded by a wire loop with an on/off switch $S$ as shown in the figure. If the switch is thrown from the off position (open circuit) to the on position (closed circuit), will a current flow in the circuit? Explain.

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Magnetic flux (in weber) in a closed circuit of resistance $20\,\Omega$ varies with time $t(s)$ as $\phi = 8t^2 - 9t + 5$. The magnitude of the induced current at $t = 0.25\,s$ will be $...mA$.

$A$ coil with an area of $500 \ cm^2$ and $1000$ turns is placed in a magnetic field of $2 \times 10^{-5} \ Wb/m^2$ perpendicular to its plane. If the coil is rotated by $180^o$ in $0.2 \ s$,the induced $emf$ in $milli-volts$ is:

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Consider a magnet surrounded by a wire loop with an on/off switch $S$ as shown in the figure. If the switch is thrown from the off position (open circuit) to the on position (closed circuit), will a current flow in the circuit? Explain.

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