MHT CET 2020 16th October Evening Shift | Electromagnetic Induction Question 129 | Physics

The length of solenoid is $$I$$ whose windings are made of material of density $$D$$ and resistivity $$\rho$$. The winding resistance is $$R$$. The inductance of solenoid is [$$m=$$ mass of winding wire, $$\mu_0=$$ permeability of free space]

$$\frac{\mu_0}{4 \pi I}\left(\frac{R m}{\rho D}\right)$$

$$\frac{\mu_0}{2 \pi I}\left(\frac{R m}{\rho D}\right)$$

$$\frac{\mu_0}{2 \pi I}\left(\frac{\rho D}{R m}\right)$$

$$\frac{\mu_0}{4 \pi /}\left(\frac{\rho D}{R m}\right)$$

MHT CET 2020 16th October Morning Shift

MCQ (Single Correct Answer)

-0

A coil of $$n$$ turns and resistance $$R \Omega$$ is connected in series with a resistance $$\frac{R}{2}$$. The combination is moved for time $$t$$ second through magnetic flux $$\phi_1$$ to $$\phi_2$$. The induced current in the circuit is

$$\frac{n\left(\phi_1-\phi_2\right)}{3 R t}$$

$$\frac{2 n\left(\phi_1-\phi_2\right)}{3 R t}$$

$$\frac{2 n\left(\phi_1-\phi_2\right)}{R t}$$

$$\frac{n\left(\phi_1-\phi_2\right)}{R t}$$

MHT CET 2019 2nd May Morning Shift

MCQ (Single Correct Answer)

-0

2. Two coils have a mutual inductance of 0.01 H . The current in the first coil changes according to equation, $I=5 \sin 200 \pi t$. The maximum value of emf induced in the second coil is

$10 \pi V$

$0.1 \pi \mathrm{~V}$

$\pi V$

$0.01 \pi \mathrm{~V}$

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