1
JEE Main 2022 (Online) 25th June Morning Shift
+4
-1

In the figure, a very large plane sheet of positive charge is shown. P1 and P2 are two points at distance l and 2l from the charge distribution. If $$\sigma$$ is the surface charge density, then the magnitude of electric fields E1 and E2 at P1 and P2 respectively are :

A
$${E_1} = \sigma /{\varepsilon _0},\,{E_2} = \sigma /2{\varepsilon _0}$$
B
$${E_1} = 2\sigma /{\varepsilon _0},\,{E_2} = \sigma /{\varepsilon _0}$$
C
$${E_1} = {E_2} = \sigma /2{\varepsilon _0}$$
D
$${E_1} = {E_2} = \sigma /{\varepsilon _0}$$
2
JEE Main 2022 (Online) 25th June Morning Shift
+4
-1

A teacher in his physics laboratory allotted an experiment to determine the resistance (G) of a galvanometer. Students took the observations for $${1 \over 3}$$ deflection in the galvanometer. Which of the below is true for measuring value of G?

A
$${1 \over 3}$$ deflection method cannot be used for determining the resistance of the galvanometer.
B
$${1 \over 3}$$ deflection method can be used and in this case the G equals to twice the value of shunt resistances.
C
$${1 \over 3}$$ deflection method can be used and in this case, the G equals to three times the value of shunt resistances.
D
$${1 \over 3}$$ deflection method can be used and in this case the G value equals to the shunt resistances.
3
JEE Main 2022 (Online) 24th June Evening Shift
+4
-1

What will be the most suitable combination of three resistors A = 2$$\Omega$$, B = 4$$\Omega$$, C = 6$$\Omega$$ so that $$\left( {{{22} \over 3}} \right)$$$$\Omega$$ is equivalent resistance of combination?

A
Parallel combination of A and C connected in series with B.
B
Parallel combination of A and B connected in series with C.
C
Series combination of A and C connected in parallel with B.
D
Series combination of B and C connected in parallel with A.
4
JEE Main 2022 (Online) 24th June Morning Shift
+4
-1

Two identical cells each of emf 1.5 V are connected in parallel across a parallel combination of two resistors each of resistance 20 $$\Omega$$. A voltmeter connected in the circuit measures 1.2 V. The internal resistance of each cell is :

A
2.5 $$\Omega$$
B
4 $$\Omega$$
C
5 $$\Omega$$
D
10 $$\Omega$$
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