1
JEE Main 2019 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-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 :
A
$${2 \over {\ln 2}}$$
B
$${\ln 2}$$
C
$$2{\ln 2}$$
D
$${1 \over 2}{\ln 2}$$
2
JEE Main 2019 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-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 :
A
5 ms
B
2.2 ms
C
3.3 ms
D
7.2 ms
3
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-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 :
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
4
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
A paramagnetic material has 1028 atoms/m3. Its magnetic susceptibility at temperature 350 K is 2.8 $$\times$$ 10–4. Its susceptibility at 300 K is :
A
3.726 $$\times$$ 10–4
B
2.672 $$\times$$ 10–4
C
3.672 $$\times$$ 10–4
D
3.267 $$\times$$ 10$$-$$4
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Modern Physics
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