JEE Main 2020 (Online) 9th January Evening Slot | Alternating Current and Electromagnetic Induction Question 144 | Physics

JEE Main 2020 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

-1

In LC circuit the inductance L = 40 mH and
capacitance C = 100 $$\mu $$F. If a voltage
V(t) = 10sin(314t) is applied to the circuit, the
current in the circuit is given as :

0.52 cos 314 t

5.2 cos 314 t

0.52 sin 314 t

10 cos 314 t

JEE Main 2020 (Online) 8th January Evening Slot

MCQ (Single Correct Answer)

-1

A shown in the figure, a battery of emf $$\varepsilon $$ is connected to an inductor L and resistance R in series. The switch is closed at t = 0. The total charge that flows from the battery, between t = 0 and t = t_c (t_c is the time constant of the circuit) is : JEE Main 2020 (Online) 8th January Evening Slot Physics - Alternating Current and Electromagnetic Induction Question 146 English

JEE Main 2020 (Online) 8th January Evening Slot Physics - Alternating Current and Electromagnetic Induction Question 146 English

$${{\varepsilon L} \over {e{R^2}}}$$

$${{\varepsilon L} \over {{R^2}}}$$

$${{\varepsilon L} \over {{R^2}}}\left( {1 - {1 \over e}} \right)$$

$${{\varepsilon R} \over {e{L^2}}}$$

JEE Main 2020 (Online) 7th January Evening Slot

MCQ (Single Correct Answer)

-1

An emf of 20 V is applied at time t = 0 to a circuit containing in series 10 mH inductor and 5 $$\Omega $$ resistor. The ratio of the currents at time t = $$\infty $$ and at t = 40 s is close to : (Take e² = 7.389)

1.06

0.84

1.15

1.46

JEE Main 2020 (Online) 7th January Morning Slot

MCQ (Single Correct Answer)

-1

Consider a circular coil of wire carrying constant current I, forming a magnetic dipole. The magnetic flux through an infinite plane that contains the circular coil and excluding the circular coil area is given by $$\phi $$_i. The magnetic flux through the area of the circular coil area is given by $$\phi $$₀. Which of the following option is correct?

$$\phi $$_i = $$\phi $$₀

$$\phi $$_i < $$\phi $$₀

$$\phi $$_i $$>$$ $$\phi $$₀

$$\phi $$_i = - $$\phi $$₀

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