JEE Main 2021 (Online) 17th March Evening Shift | Current Electricity Question 182 | Physics

The four arms of a Wheatstone bridge have resistances as shown in the figure. A galvanometer of 15$$\Omega$$ resistance is connected across BD. Calculate the current through the galvanometer when a potential difference of 10V is maintained across AC.

JEE Main 2021 (Online) 17th March Evening Shift Physics - Current Electricity Question 182 English

JEE Main 2021 (Online) 17th March Evening Shift Physics - Current Electricity Question 182 English

4.87 $$\mu$$A

4.87 mA

2.44 mA

2.44 $$\mu$$A

JEE Main 2021 (Online) 17th March Morning Shift

MCQ (Single Correct Answer)

-1

A current of 10A exists in a wire of cross-sectional area of 5 mm² with a drift velocity of 2 $$\times$$ 10^$$-$$3 ms^$$-$$1. The number of free electrons in each cubic meter of the wire is ___________.

625 $$\times$$ 10²⁵

1 $$\times$$ 10²³

2 $$\times$$ 10²⁵

2 $$\times$$ 10⁶

JEE Main 2021 (Online) 16th March Evening Shift

MCQ (Single Correct Answer)

-1

A resistor develops 500 J of thermal energy in 20 s when a current of 1.5A is passed through it. If the current is increased from 1.5A to 3A, what will be the energy developed in 20 s.

1000 J

2000 J

1500 J

500 J

JEE Main 2021 (Online) 16th March Morning Shift

MCQ (Single Correct Answer)

-1

A conducting wire of length 'l', area of cross-section A and electric resistivity $$\rho$$ is connected between the terminals of a battery. A potential difference V is developed between its ends, causing an electric current.

If the length of the wire of the same material is doubled and the area of cross-section is halved, the resultant current would be :

$$4{{VA} \over {\rho l}}$$

$${3 \over 4}{{VA} \over {\rho l}}$$

$${1 \over 4}{{VA} \over {\rho l}}$$

$${1 \over 4}{{\rho l} \over {VA}}$$

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