1
NEET 2023 Manipur
MCQ (Single Correct Answer)
+4
-1
Change Language

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 $$=1.6 \times 10^{-19} \mathrm{C}$$ ) :

A
$$\frac{6.25 \times 10^4}{\pi} \mathrm{ms}^{-1}$$
B
$$\frac{6.25}{\pi} \times 10^3 \mathrm{~ms}^{-1}$$
C
$$\frac{6.25}{\pi} \mathrm{ms}^{-1}$$
D
$$\frac{6.25 \times 10^5}{\pi} \mathrm{ms}^{-1}$$
2
NEET 2023 Manipur
MCQ (Single Correct Answer)
+4
-1
Change Language

An object is mounted on a wall. Its image of equal size is to be obtained on a parallel wall with the help of a convex lens placed between these walls. The lens is kept at distance x in front of the second wall. The required focal length of the lens will be :

A
less than $$\frac{x}{4}$$
B
more than $$\frac{x}{4}$$ but less than $$\frac{x}{2}$$
C
$$\frac{x}{2}$$
D
$$\frac{x}{4}$$
3
NEET 2023 Manipur
MCQ (Single Correct Answer)
+4
-1
Change Language

If a conducting sphere of radius $$\mathrm{R}$$ is charged. Then the electric field at a distance $$\mathrm{r}(\mathrm{r} > \mathrm{R})$$ from the centre of the sphere would be, $$(\mathrm{V}=$$ potential on the surface of the sphere)

A
$$\frac{r V}{R^2}$$
B
$$\frac{R^2 V}{r^3}$$
C
$$\frac{R V}{r^2}$$
D
$$\frac{\mathrm{V}}{\mathrm{r}}$$
4
NEET 2023 Manipur
MCQ (Single Correct Answer)
+4
-1
Change Language

A block of mass 2 kg is placed on inclined rough surface AC (as shown in figure) of coefficient of friction $$\mu$$. If g = 10 m s$$^{-2}$$, the net force (in N) on the block will be:

NEET 2023 Manipur Physics - Laws of Motion Question 4 English

A
10$$\sqrt3$$
B
zero
C
10
D
20
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