1
NEET 2023 Manipur
+4
-1

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
+4
-1

To produce an instantaneous displacement current of $$2 \mathrm{~mA}$$ in the space between the parallel plates of a capacitor of capacitance $$4 ~\mu \mathrm{F}$$, the rate of change of applied variable potential difference $$\left(\frac{\mathrm{dV}}{\mathrm{dt}}\right)$$ must be :-

A
$$800 \mathrm{~V} / \mathrm{s}$$
B
$$500 \mathrm{~V} / \mathrm{s}$$
C
$$200 \mathrm{~V} / \mathrm{s}$$
D
$$400 \mathrm{~V} / \mathrm{s}$$
3
NEET 2023 Manipur
+4
-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 :

A
220 cm
B
330 cm
C
115 cm
D
332 cm
4
NEET 2023
+4
-1

The magnitude and direction of the current in the following circuit is :- A
0.5 A from $$A$$ to $$B$$ through $$E$$
B
$$\frac{5}{9} A$$ from $$A$$ to $$B$$ through $$E$$
C
1.5 A from $$B$$ to $$A$$ through $$E$$
D
0.2 A from $$B$$ to $$A$$ through $$E$$
NEET Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
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