1
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
2
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
3
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
In the above circuit, C = $${{\sqrt 3 } \over 2}$$$$\mu$$F, R2 = 20 $$\Omega$$, L = $${{\sqrt 3 } \over {10}}$$ H and R1 = 10 $$\Omega$$. Current in L-R1 path is I1 and in C-R2 path it is I2 . The voltage of A.C. source is given by, V = 200 $${\sqrt 2 }$$ sin (100 t) volts . The phase difference between I1 and I2 is :

A
150o
B
90o
C
30o
D
0o
4
JEE Main 2019 (Online) 11th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
A 27 mW laser beam has a cross-sectional area of 10 mm2. The magnitude of the maximum electric field in this electromagnetic wave is given by :
[Given permittivity of space $$\in$$0 = 9 $$\times$$ 10–12 SI units, Speed of light c = 3 $$\times$$ 108 m/s]
A
2 kV/m
B
1 kV/m
C
1.4 kV/m
D
0.7 kV/m
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