1
JEE Main 2020 (Online) 6th September Evening Slot
Numerical
+4
-0
In a series LR circuit, power of 400W is dissipated from a source of 250 V, 50 Hz. The power factor of the circuit is 0.8. In order to bring the power factor to unity, a capacitor of value C is added in series to the L and R. Taking the value of C as $$\left( {{n \over {3\pi }}} \right)$$ $$\mu$$F, then value of n is __________.
2
JEE Main 2020 (Online) 6th September Morning Slot
Numerical
+4
-0
Suppose that intensity of a laser is $${{315} \over \pi }$$ W/m2.
The rms electric field, in units of V/m associated with this source is close to the nearest integer is __________.

$$\in$$0 = 8.86 × 10–12 C2 Nm–2; c = 3 × 108 ms–1)
3
JEE Main 2020 (Online) 9th January Morning Slot
Numerical
+4
-0
In a fluorescent lamp choke (a small transformer) 100 V of reverse voltage is produced when the choke current changes uniformly from 0.25 A to 0 in a duration of 0.025 ms. The self-inductance of the choke (in mH) is estimated to be ________.
4
JEE Main 2020 (Online) 7th January Morning Slot
Numerical
+4
-0
A loop ABCDEFA of straight edges has six corner points A(0, 0, 0), B(5, 0, 0), C(5, 5, 0), D (0, 5, 0), E(0, 5, 5) and F(0, 0, 5). The magnetic field in this region is $$\overrightarrow B = \left( {3\widehat i + 4\widehat k} \right)T$$ . The quantity of flux through the loop ABCDEFA (in Wb) is _______.
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