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JEE Main 2021 (Online) 31st August Evening Shift
Numerical
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-1
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A long solenoid with 1000 turns/m has a core material with relative permeability 500 and volume 103 cm3. If the core material is replaced by another material having relative permeability of 750 with same volume maintaining same current of 0.75 A in the solenoid, the fractional change in the magnetic moment of the core would be approximately $$\left( {{x \over {499}}} \right)$$. Find the value of x.
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2
JEE Main 2021 (Online) 31st August Evening Shift
Numerical
+4
-1
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A particle is moving with constant acceleration 'a'. Following graph shows v2 versus x(displacement) plot. The acceleration of the particle is ___________ m/s2.

JEE Main 2021 (Online) 31st August Evening Shift Physics - Motion in a Straight Line Question 53 English
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3
JEE Main 2021 (Online) 31st August Evening Shift
Numerical
+4
-1
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In a Young's double slit experiment, the slits are separated by 0.3 mm and the screen is 1.5 m away from the plane of slits. Distance between fourth bright fringes on both sides of central bright is 2.4 cm. The frequency of light used is ______________ $$\times$$ 1014 Hz.
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4
JEE Main 2021 (Online) 31st August Evening Shift
Numerical
+4
-1
Change Language
The diameter of a spherical bob is measured using a vernier callipers. 9 divisions of the main scale, in the vernier callipers, are equal to 10 divisions of vernier scale. One main scale division is 1 mm. The main scale reading is 10 mm and 8th division of vernier scale was found to coincide exactly with one of the main scale division. If the given vernier callipers has positive zero error of 0.04 cm, then the radius of the bob is ___________ $$\times$$ 10$$-$$2 cm.
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