JEE Main 2021 (Online) 25th July Morning Shift | Current Electricity Question 103 | Physics

JEE Main 2021 (Online) 25th July Morning Shift

MCQ (Single Correct Answer)

-1

In the given figure, there is a circuit of potentiometer of length AB = 10 m. The resistance per unit length is 0.1 $$\Omega$$ per cm. Across AB, a battery of emf E and internal resistance 'r' is connected. The maximum value of emf measured by this potentiometer is :

JEE Main 2021 (Online) 25th July Morning Shift Physics - Current Electricity Question 103 English

JEE Main 2021 (Online) 25th July Morning Shift Physics - Current Electricity Question 103 English

5 V

2.25 V

6 V

2.75 V

JEE Main 2021 (Online) 22th July Evening Shift

MCQ (Single Correct Answer)

-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

JEE Main 2021 (Online) 22th July Evening Shift Physics - Current Electricity Question 105 English

0.0858 m$$\Omega$$

1.420 m$$\Omega$$

0.858 m$$\Omega$$

2.170 m$$\Omega$$

JEE Main 2021 (Online) 20th July Morning Shift

MCQ (Single Correct Answer)

-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 :

10A

JEE Main 2021 (Online) 18th March Morning Shift

MCQ (Single Correct Answer)

-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 :

3.9

8.4

7.5

3.0

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