1
JEE Main 2018 (Online) 15th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
A plane polarized light is incident on a polariser with its pass axis aking angle $$\theta$$ with x-axis, as shown in the figure. At four different values of $$\theta ,\,\theta$$ = 8o, 38o, 188o and 218o, the observed intensities are same.
What is the angle between the direction of polarization and x-axis ?
A
98o
B
128o
C
203o
D
45o
2
JEE Main 2018 (Online) 15th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Truth table for the following digital circuit will be :
A
B
C
D
3
JEE Main 2018 (Online) 15th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
A current of 1 A is flowing on the sides of an equilateral triangle of side 4.5 $$\times$$ 10-2 m. The magnetic field at the center of the triangle will be :
A
2 $$\times$$ 10-5 Wb/m2
B
Zero
C
8 $$\times$$ 10-5 Wb/m2
D
4 $$\times$$ 10-5 Wb/m2
4
JEE Main 2018 (Online) 15th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
At the center of a fixed large circular coil of radius R, a much smaller circular coil of radius r is placed. The two coils are concentric and are in the same plane. The larger coil carries a current I. The smaller coil is set to rotate with a constant angular velocity $$\omega$$ about an axis along their common diameter. Calculate the emf induced in their smaller coil after a time t of its start of rotation.
A
$${{{\mu _o}{\rm I}} \over {2\,R}}$$ $$\omega$$ $$\pi$$ r2 sin$$\omega$$ t
B
$${{{\mu _o}{\rm I}} \over {4\,R}}$$ $$\omega$$ $$\pi$$ r2 sin$$\omega$$ t
C
$${{{\mu _o}{\rm I}} \over {4\,R}}$$ $$\omega$$ r2 sin$$\omega$$ t
D
$${{{\mu _o}{\rm I}} \over {2\,R}}$$ $$\omega$$ r2 sin$$\omega$$ t
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