1
JEE Main 2023 (Online) 29th January Morning Shift
+4
-1

Ratio of thermal energy released in two resistors R and 3R connected in parallel in an electric circuit is :

A
1 : 1
B
1 : 27
C
1 : 3
D
3 : 1
2
JEE Main 2023 (Online) 25th January Evening Shift
+4
-1

The resistance of a wire is 5 $$\Omega$$. It's new resistance in ohm if stretched to 5 times of it's original length will be :

A
25
B
625
C
5
D
125
3
JEE Main 2023 (Online) 25th January Morning Shift
+4
-1

A uniform metallic wire carries a current 2 A, when 3.4 V battery is connected across it. The mass of uniform metallic wire is 8.92 $$\times$$ 10$$^{-3}$$ kg, density is 8.92 $$\times$$ 10$$^{3}$$ kg/m$$^3$$ and resistivity is 1.7 $$\times$$ 10$$^{-8}~\Omega$$-$$\mathrm{m}$$. The length of wire is :

A
$$l=100$$ m
B
$$l=6.8$$ m
C
$$l=5$$ m
D
$$l=10$$ m
4
JEE Main 2023 (Online) 24th January Evening Shift
+4
-1

A cell of emf 90 V is connected across series combination of two resistors each of 100$$\Omega$$ resistance. A voltmeter of resistance 400$$\Omega$$ is used to measure the potential difference across each resistor. The reading of the voltmeter will be :

A
40 V
B
90 V
C
45 V
D
80 V
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