. The resistivity of a potentiometer wire is \[40\times {{10}^{-8}}\,ohm-m\] and its area of cross-section is \[8\times {{10}^{-6}}\,{{m}^{2}}\]. If 0.2 amp current is flowing through the wire, the potential gradient will be [MP PMT/PET 1998]

. The resistivity of a potentiometer wire is \[40\times {{10}^{-8}}\,o

1.	. The resistivity of a potentiometer wire is \[40\times {{10}^{-8}}\,ohm-m\] and its area of cross-section is \[8\times {{10}^{-6}}\,{{m}^{2}}\]. If 0.2 amp current is flowing through the wire, the potential gradient will be [MP PMT/PET 1998]
A.	\[{{10}^{-2}}\,volt/m\]
B.	\[{{10}^{-1}}\,volt/m\]
C.	\[4\,R\]
D.	\[1\,volt/m\]
Answer» B. \[{{10}^{-1}}\,volt/m\]

Discussion

No Comment Found

Related MCQs

A galvanometer of resistance 36 W is changed into an ammeter by using a shunt of 4 W. The fraction f0 of total current passing through the galvanometer is [BCECE 2003]
The resistance\[{{R}_{t}}\] of a conductor varies with temperature t as shown in the figure. If the variation is represented by \[{{R}_{t}}={{R}_{0}}[1+\alpha t+\beta {{t}^{2}}]\], then [CPMT 1988]
The V-i graphs A and B drawn for two voltameters. Identify each graph
The graph which represents the relation between the total resistance R of a multi range moving coil voltmeter and its full scale deflection V is
In a copper voltameter, mass deposited in 30 second is m gm. If the time-current graph is as shown in figure, ECE of copper is
The resistance of a 5 cm long wire is 10 W. It is uniformly stretched so that its length becomes 20 cm. The resistance of the wire is [MH CET 2002]
Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10 W when a potential difference of 20 V is applied between its ends [Kerala (Engg.) 2001]
If potential \[V=100\pm 0.5\,Volt\] and current \[I=10\pm 0.2\] amp are given to us. Then what will be the value of resistance [RPET 2001]
At what temperature will the resistance of a copper wire become three times its value at 0oC (Temperature coefficient of resistance for copper = 4 × 10?3 per oC ) [MP PET 2000]
An electron (charge = 1.6 × 10?19 coulomb) is moving in a circle of radius 5.1 × 10?11m at a frequency of 6.8 × 1015 revolutions/sec. The equivalent current is approximately [MP PET 2000]

. The resistivity of a potentiometer wire is \[40\times {{10}^{-8}}\,ohm-m\] and its area of cross-section is \[8\times {{10}^{-6}}\,{{m}^{2}}\]. If 0.2 amp current is flowing through the wire, the potential gradient will be [MP PMT/PET 1998]

Discussion

No Comment Found

Related MCQs

Reply to Comment