1
JEE Main 2021 (Online) 26th August Morning Shift
Numerical
+4
-1
Out of Syllabus
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An amplitude modulated wave is represented by
Cm(t) = 10(1 + 0.2 cos 12560t) sin(111 $$\times$$ 104t) volts. The modulating frequency in kHz will be ................. .
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2
JEE Main 2021 (Online) 26th August Morning Shift
Numerical
+4
-1
Change Language
Two short magnetic dipoles m1 and m2 each having magnetic moment of 1 Am2 are placed at point O and P respectively. The distance between OP is 1 meter. The torque experienced by the magnetic dipole m2 due to the presence of m1 is ........... $$\times$$ 10$$-$$7 Nm.

JEE Main 2021 (Online) 26th August Morning Shift Physics - Magnetic Effect of Current Question 99 English
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3
JEE Main 2021 (Online) 26th August Morning Shift
Numerical
+4
-1
Change Language
Two travelling waves produces a standing wave represented by equation,

y = 1.0 mm cos(1.57 cm$$-$$1) x sin(78.5 s$$-$$1)t.

The node closest to the origin in the region x > 0 will be at x = .............. cm.
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4
JEE Main 2021 (Online) 26th August Morning Shift
Numerical
+4
-1
Change Language
White light is passed through a double slit and interference is observed on a screen 1.5 m away. The separation between the slits is 0.3 mm. The first violet and red fringes are formed 2.0 mm and 3.5 mm away from the central white fringes. the difference in wavelengths of red and violet light is ................ nm.
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