JEE Main 2019 (Online) 8th April Evening Slot | Alternating Current and Electromagnetic Induction Question 159 | Physics

JEE Main 2019 (Online) 8th April Evening Slot

MCQ (Single Correct Answer)

-1

A circuit connected to an ac source of emf e = e₀sin(100t) with t in seconds, gives a phase difference of $$\pi $$/4 between the emf e and current i. Which of the following circuits will exhibit this ?

RC circuit with R = 1 k$$\Omega $$ and C = 1μF

RL circuit with R = 1k$$\Omega $$ and L = 1mH

RC circuit with R = 1k$$\Omega $$ and C = 10 μF

RL circuit with R = 1 k$$\Omega $$ and L = 10 mH

JEE Main 2019 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

-1

A 20 Henry inductor coil is connected to a 10 ohm resistance in series as shown in figure. The time at which rate of dissipation of energy (joule's heat) across resistance is equal to the rate at which magnetic energy is stored in the inductor is : JEE Main 2019 (Online) 8th April Morning Slot Physics - Alternating Current and Electromagnetic Induction Question 161 English

JEE Main 2019 (Online) 8th April Morning Slot Physics - Alternating Current and Electromagnetic Induction Question 161 English

$${2 \over {\ln 2}}$$

$${\ln 2}$$

$$2{\ln 2}$$

$${1 \over 2}{\ln 2}$$

JEE Main 2019 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

-1

An alternating voltage v(t) = 220 sin 100 $$\pi $$t volt is applied to a purely resistance load of 50$$\Omega $$ . The time taken for the current to rise from half of the peak value to the peak value is :

5 ms

2.2 ms

3.3 ms

7.2 ms

JEE Main 2019 (Online) 12th January Evening Slot

MCQ (Single Correct Answer)

-1

A 10 m long horizontal wire extends from North East to South West. It is falling with a speed of 5.0 ms^–1, at right angles to the horizontal component of the earth's magnetic field of 0.3 $$ \times $$ 10^–4 Wb/m². The value of the induced emf in wire is :

0.3 $$ \times $$ 10^–3 V

2.5 $$ \times $$ 10^–3 V

1.5 $$ \times $$ 10^–3 V

1.1 $$ \times $$ 10^–3 V

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