1
JEE Main 2021 (Online) 25th February Morning Shift
Numerical
+4
-1
Out of Syllabus
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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 = _________.

JEE Main 2021 (Online) 25th February Morning Shift Physics - Current Electricity Question 170 English
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2
JEE Main 2021 (Online) 24th February Evening Shift
Numerical
+4
-1
Change Language
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 _________.
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3
JEE Main 2020 (Online) 4th September Evening Slot
Numerical
+4
-0
Change Language
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 _______. JEE Main 2020 (Online) 4th September Evening Slot Physics - Current Electricity Question 180 English
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4
JEE Main 2020 (Online) 9th January Evening Slot
Numerical
+4
-0
Change Language
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________. JEE Main 2020 (Online) 9th January Evening Slot Physics - Current Electricity Question 187 English
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