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JEE Main 2021 (Online) 31st August Evening Shift
Numerical
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A parallel plate capacitor of capacitance 200 $$\mu$$F is connected to a battery of 200 V. A dielectric slab of dielectric constant 2 is now inserted into the space between plates of capacitor while the battery remain connected. The change in the electrostatic energy in the capacitor will be ____________J.
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JEE Main 2021 (Online) 31st August Evening Shift
Numerical
+4
-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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3
JEE Main 2021 (Online) 31st August Evening Shift
Numerical
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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 Question 82 English
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4
JEE Main 2021 (Online) 31st August Evening Shift
Numerical
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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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