1
NEET 2022 Phase 2
+4
-1

The sliding contact C is at one fourth of the length of the potentiometer wire (AB) from A as shown in the circuit diagram. If the resistance of the wire AB is R0, then the potential drop (V) across the resistor R is

A
$${{2{V_0}R} \over {2{R_0} + 3R}}$$
B
$${{4{V_0}R} \over {3{R_0} + 16R}}$$
C
$${{4{V_0}R} \over {3{R_0} + R}}$$
D
$${{2{V_0}R} \over {4{R_0} + R}}$$
2
NEET 2022 Phase 1
+4
-1

Two resistors of resistance, 100 $$\Omega$$ and 200 $$\Omega$$ are connected in parallel in an electrical circuit. The ratio of the thermal energy developed in 100 $$\Omega$$ to that in 200 $$\Omega$$ in a given time is

A
1 : 2
B
2 : 1
C
1 : 4
D
4 : 1
3
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
4
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
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