1
NEET 2022 Phase 1
+4
-1

A copper wire of length 10 m and radius $$\left( {{{{{10}^{ - 2}}} \over {\sqrt \pi }}} \right)$$ m has electrical resistance of 10 $$\Omega$$. The current density in the wire for an electric field strength of 10 (V/m) is

A
104 A/m2
B
106 A/m2
C
10$$-$$5 A/m2
D
105 A/m2
2
NEET 2022 Phase 1
+4
-1

A wheatstone bridge is used to determine the value of unknown resistance X by adjusting the variable resistance Y as shown in the figure. For the most precise measurement of X, the resistance P and Q

A
Should be approximately equal to 2X
B
Should be approximately equal and are small
C
Should be very large and unequal
D
Do not play any significant role
3
NEET 2021
+4
-1
In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V replaces the first cell, then at what length of the wire, the balance point occurs?
A
62 cm
B
60 cm
C
21.6 cm
D
64 cm
4
NEET 2021
+4
-1
The effective resistance of a parallel connection that consists of four wires of equal length, equal area of cross-section and same material is 0.25$$\Omega$$. What will be the effective resistance if they are connected in series?
A
4$$\Omega$$
B
0.25$$\Omega$$
C
0.5$$\Omega$$
D
1$$\Omega$$
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