1
JEE Main 2019 (Online) 9th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A very long solenoid of radius R is carrying current I(t) = kte–at(k > 0), as a function of time (t $$ \ge $$ 0). counter clockwise current is taken to be positive. A circular conducting coil of radius 2R is placed in the equatorial plane of the solenoid and concentric with the solenoid. The current induced in the outer coil is correctly depicted, as a function of time, by :-
A
JEE Main 2019 (Online) 9th April Evening Slot Physics - Electromagnetic Induction Question 84 English Option 1
B
JEE Main 2019 (Online) 9th April Evening Slot Physics - Electromagnetic Induction Question 84 English Option 2
C
JEE Main 2019 (Online) 9th April Evening Slot Physics - Electromagnetic Induction Question 84 English Option 3
D
JEE Main 2019 (Online) 9th April Evening Slot Physics - Electromagnetic Induction Question 84 English Option 4
2
JEE Main 2019 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The total number of turns and cross-section area in a solenoid is fixed. However, its length L is varied by adjusting the separation between windings. The inductance of solenoid will be proportional to :
A
1/L2
B
1/L
C
L
D
L2
3
JEE Main 2019 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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 - Electromagnetic Induction Question 87 English
A
$${2 \over {\ln 2}}$$
B
$${\ln 2}$$
C
$$2{\ln 2}$$
D
$${1 \over 2}{\ln 2}$$
4
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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 :
A
0.3 $$ \times $$ 10–3 V
B
2.5 $$ \times $$ 10–3 V
C
1.5 $$ \times $$ 10–3 V
D
1.1 $$ \times $$ 10–3 V
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