1
JEE Main 2023 (Online) 29th January Evening Shift
+4
-1
Out of Syllabus

With the help of potentiometer, we can determine the value of emf of a given cell. The sensitivity of the potentiometer is

(A) directly proportional to the length of the potentiometer wire

(B) directly proportional to the potential gradient of the wire

(C) inversely proportional to the potential gradient of the wire

(D) inversely proportional to the length of the potentiometer wire

Choose the correct option for the above statements :

A
A only
B
B and D only
C
A and C only
D
inversely C only
2
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
3
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
4
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
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