NEET 2023 Manipur | Current Electricity Question 12 | Physics

A copper wire of radius $$1 \mathrm{~mm}$$ contains $$10^{22}$$ free electrons per cubic metre. The drift velocity for free electrons when $$10 \mathrm{~A}$$ current flows through the wire will be (Given, charge on electron $$=1.6 \times 10^{-19} \mathrm{C}$$ ) :

$$\frac{6.25 \times 10^4}{\pi} \mathrm{ms}^{-1}$$

$$\frac{6.25}{\pi} \times 10^3 \mathrm{~ms}^{-1}$$

$$\frac{6.25}{\pi} \mathrm{ms}^{-1}$$

$$\frac{6.25 \times 10^5}{\pi} \mathrm{ms}^{-1}$$

NEET 2023 Manipur

MCQ (Single Correct Answer)

-1

The emf of a cell having internal resistance $$1 \Omega$$ is balanced against a length of $$330 \mathrm{~cm}$$ on a potentiometer wire. When an external resistance of $$2 \Omega$$ is connected across the cell, the balancing length will be :

220 cm

330 cm

115 cm

332 cm

NEET 2023

MCQ (Single Correct Answer)

-1

The magnitude and direction of the current in the following circuit is :-

NEET 2023 Physics - Current Electricity Question 14 English

0.5 A from $$A$$ to $$B$$ through $$E$$

$$\frac{5}{9} A$$ from $$A$$ to $$B$$ through $$E$$

1.5 A from $$B$$ to $$A$$ through $$E$$

0.2 A from $$B$$ to $$A$$ through $$E$$

NEET 2023

MCQ (Single Correct Answer)

-1

If the galvanometer $$G$$ does not show any deflection in the circuit shown, the value of $$R$$ is given by:

NEET 2023 Physics - Current Electricity Question 16 English

50 $$\Omega$$

100 $$\Omega$$

400 $$\Omega$$

200 $$\Omega$$

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