ExamSIDE
Questions
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1
JEE Main 2021 (Online) 22th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
A Copper (Cu) rod of length 25 cm and cross-sectional area 3 mm2 is joined with a similar Aluminium (Al) rod as shown in figure. Find the resistance of the combination between the ends A and B.

(Take Resistivity of Copper = 1.7 $$\times$$ 10$$-$$8 $$\Omega$$m and Resistivity of Aluminium = 2.6 $$\times$$ 10$$-$$8 $$\Omega$$m)

JEE Main 2021 (Online) 22th July Evening Shift Physics - Current Electricity Question 105 English
A
0.0858 m$$\Omega$$
B
1.420 m$$\Omega$$
C
0.858 m$$\Omega$$
D
2.170 m$$\Omega$$
2
JEE Main 2021 (Online) 20th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
JEE Main 2021 (Online) 20th July Morning Shift Physics - Current Electricity Question 108 English
The value of current in the 6 $$\Omega$$ resistance is :
A
4A
B
8A
C
10A
D
6A
3
JEE Main 2021 (Online) 18th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
In the experiment of Ohm's law, a potential difference of 5.0 V is applied across the end of a conductor of length 10.0 cm and diameter of 5.00 mm. The measured current in the conductor is 2.00 A. The maximum permissible percentage error in the resistivity of the conductor is :
A
3.9
B
8.4
C
7.5
D
3.0
4
JEE Main 2021 (Online) 17th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Two cells of emf 2E and E with internal resistance r1 and r2 respectively are connected in series to an external resistor R (see figure). The value of R, at which the potential difference across the terminals of the first cell becomes zero is

JEE Main 2021 (Online) 17th March Evening Shift Physics - Current Electricity Question 113 English
A
r1 $$-$$ r2
B
$${{{r_1}} \over 2} - {r_2}$$
C
$${{{r_1}} \over 2} + {r_2}$$
D
r1 + r2
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