1
NEET 2023 Manipur
+4
-1

The equivalent capacitance of the arrangement shown in figure is: A
30 $$\mu$$F
B
15 $$\mu$$F
C
25 $$\mu$$F
D
20 $$\mu$$F
2
NEET 2023 Manipur
+4
-1

A certain wire $$\mathrm{A}$$ has resistance $$81 ~\Omega$$. The resistance of another wire $$\mathrm{B}$$ of same material and equal length but of diameter thrice the diameter of A will be :

A
$$81 ~\Omega$$
B
$$9 ~\Omega$$
C
$$729 ~\Omega$$
D
$$243 ~\Omega$$
3
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
$$\frac{6.25 \times 10^5}{\pi} \mathrm{ms}^{-1}$$
4
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
$$400 \mathrm{~V} / \mathrm{s}$$
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