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
2
NEET 2021
MCQ (Single Correct Answer)
+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$$\Omega$$
3
NEET 2021
MCQ (Single Correct Answer)
+4
-1
Column - I gives certain physical terms associated with flow of current through a metallic conductor. Column-II gives some mathematical relations involving electrical quantities. Match column-I and column-II with appropriate relations.
Column - I
Column - II
(A)
Drift Velocity
(P)
$${m \over {n{e^2}p}}$$
(B)
Electrical Resistivity
(Q)
$$ne{\upsilon _d}$$
(C)
Relaxation Period
(R)
$${{eE} \over m}\tau $$
(D)
Current Density
(S)
$${E \over J}$$
A
(A)-(R); (B)-(Q); (C)-(S); (D)-(P)
B
(A)-(R); (B)-(S); (C)-(P); (D)-(Q)
C
(A)-(R); (B)-(S); (C)-(Q); (D)-(P)
D
(A)-(R); (B)-(P); (C)-(S); (D)-(Q)
4
NEET 2021
MCQ (Single Correct Answer)
+4
-1
Three resistors having resistances r1, r2 and r3 are connected as shown in the given circuit. The ratio $${{{i_3}} \over {{i_1}}}$$ of currents in terms of resistances used in the circuit is :
