1
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 _________.
2
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 _______.
3
JEE Main 2020 (Online) 9th January Evening Slot
Numerical
+4
-0
In a meter bridge experiment S is a standard resistance. R is a resistance wire. It is found that balancing length is $$l$$ = 25 cm. If R is replaced by a wire of half length and half diameter that of R of same material, then the balancing distance $$l'$$ (in cm) will now be________.
4
JEE Main 2020 (Online) 8th January Evening Slot
Numerical
+4
-0
The series combination of two batteries, both of the same emf 10 V, but different internal resistance of 20$$\Omega$$ and 5$$\Omega$$, is connected to the parallel combination of two resistors 30$$\Omega$$ and R $$\Omega$$. The voltage difference across the battery of internal resistance 20$$\Omega$$ is zero, the value of R (in $$\Omega$$) is : _______