1
NEET 2024 (Re-Examination)
+4
-1

A uniform wire of diameter $$d$$ carries a current of $$100 \mathrm{~mA}$$ when the mean drift velocity of electrons in the wire is $$v$$. For a wire of diameter $$\frac{d}{2}$$ of the same material to carry a current of $$200 \mathrm{~mA}$$, the mean drift velocity of electrons in the wire is

A
$$4 v$$
B
$$8 v$$
C
$$v$$
D
$$2 v$$
2
NEET 2024 (Re-Examination)
+4
-1

A uniform metal wire of length $$l$$ has $$10 \Omega$$ resistance. Now this wire is stretched to a length $$2l$$ and then bent to form a perfect circle. The equivalent resistance across any arbitrary diameter of that circle is

A
$$10 \Omega$$
B
$$5 \Omega$$
C
$$40 \Omega$$
D
$$20 \Omega$$
3
NEET 2024 (Re-Examination)
+4
-1

The given circuit shows a uniform straight wire $$A B$$ of $$40 \mathrm{~cm}$$ length fixed at both ends. In order to get zero reading in the galvanometer $$G$$, the free end of $$J$$ is to be placed from $$B$$ at:

A
32 cm
B
8 cm
C
16 cm
D
24 cm
4
NEET 2024
+4
-1

The terminal voltage of the battery, whose emf is $$10 \mathrm{~V}$$ and internal resistance $$1 \Omega$$, when connected through an external resistance of $$4 \Omega$$ as shown in the figure is:

A
4 V
B
6 V
C
8 V
D
10 V
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