1
JEE Main 2021 (Online) 25th February Evening Shift
Numerical
+4
-1
A current of 6A enters one corner P of an equilateral triangle PQR having 3 wires of resistance 2$$\Omega$$ each and leaves by the corner R. The currents i1 in ampere is _________.

2
JEE Main 2021 (Online) 25th February Morning Shift
Numerical
+4
-1
Out of Syllabus
In the given circuit of potentiometer, the potential difference E across AB (10 m length) is larger than E1 and E2 as well. For key K1 (closed), the jockey is adjusted to touch the wire at point J1 so that there is no deflection in the galvanometer. Now the first battery (E1) is replaced by second battery (E2) for working by making K1 open and K2 closed. The galvanometer gives then null deflection at J2. The value of $${{{E_1}} \over {{E_2}}}$$ is $${a \over b}$$, where a = _________.

3
JEE Main 2021 (Online) 24th February Evening Shift
Numerical
+4
-1
A cylindrical wire of radius 0.5 mm and conductivity 5 $$\times$$ 107 S/m is subjected to an electric field of 10 mV/m. The expected value of current in the wire will be x3$$\pi$$ mA. The value of x is _________.
4
JEE Main 2020 (Online) 4th September Evening Slot
Numerical
+4
-0
Four resistances 40 $$\Omega$$, 60 $$\Omega$$, 90 $$\Omega$$ and 110 $$\Omega$$ make the arms of a quadrilateral ABCD. Across AC is a battery of emf 40 V and internal resistance negligible.The potential difference across BD in V is _______.