Home/Class 12/Physics/

Question and Answer

If I current is flowing in a potentiometer wire of length \(L\) and resistance \(R\), then potential gradient will be

(A) \(\dfrac {IR}{L}\)
(B) \(IRL\)
(C) \(\dfrac {RL}{I}\)
(D) \(\dfrac {IL}{R}\)

Answer

Answer: A
The potential is the fall of potential per unit length of potentiometer wire, hence
\(k = \dfrac{V}{L}\)

\(k = \dfrac{IR}{L}\)
To Keep Reading This Answer, Download the App
4.6
star pngstar pngstar pngstar pngstar png
Review from Google Play
To Keep Reading This Answer, Download the App
4.6
star pngstar pngstar pngstar pngstar png
Review from Google Play
Correct35
Incorrect0
Watch More Related Solutions
What should be the magnitude and direction of electric field?
(A) \(7 Nc^{-1}\), Vertically up \(\perp\) to velocity
(B) \(7 Nc^{-1}\), horizontally and \(\perp\) to velocity
(C) \(14 Nc^{-1}\), horizontally parallel to velocity
(D) none of these
If \(\displaystyle R=\{ (x,y):x, y \in Z ,x^{2}+y^{2}\leq 4 \}\) is a relation in \(Z\) then domain \(D\) is

(A) \(\displaystyle \left \{ -2,-1,0,1,2\right \}\)
(B) \(\displaystyle \left \{ -2,-1,0 \right \}\)
(C) \(\displaystyle \left \{ 0,1,2\right \}\)
(D) None of these
A force is given by \(F = at + b{t^2}\), where \(t\) is time, the dimensions of \(a\) and \(b\) are respectively :( )
A. \(\left[ {ML{T^{ - 4}}} \right]\) and \(\left[ {ML{T^{ - 1}}} \right]\)
B. \(\left[ {ML{T^{ - 1}}} \right]\) and \(\left[ {ML{T^0}} \right]\)
C. \(\left[ {ML{T^{ - 3}}} \right]\) and \(\left[ {ML{T^{ - 4}}} \right]\)
D. \(\left[ {ML{T^{ - 3}}} \right]\) and \(\left[ {ML{T^0}} \right]\)
The Coefficient of Variation is given by:
(A) \(\dfrac{Mean}{\ Standard \ \ deviation } \times 100\)
(B) \(\dfrac{\ Standard \ \ deviation }{Mean}\)
(C) \(\dfrac{Standard \ \ deviation }{Mean }\times 100\)
(D) \(\dfrac{Mean}{Standard \ Deviation}\)
Solubility of KCl is maximum in :
(A) \(CH_3CH_2OH\)
(B) \(CH_3OCH_3\)
(C) \(H_2O\)
(D) \(CH_3COOH\)
On hydrolysis, \(PCI_3\) gives:
(A) \(H_3PO_3\)
(B) \(H_3PO_4\)
(C) \(POCI_3\)
(D) \(HPO_3\)
If \(f(x) = \left\{ \begin{array} { l l } { x - 5 } & { x \leq 1 } \\ { 4 x ^ { 2 } - 9 } & { 1 < x < 2 } \\ { 3 x + 4 } & { x \geq 2 } \end{array} \right.\) then \(f' \left( 2 \right) =\) is
(A) \(0\)
(B) \(2\)
(C) \(3\)
(D) \(4\)
The correct order of pseudohalide,polyhalide and interhalogen are 
(A) \(BrI^-_2, OCN^-,IF_5\)
(B) \(IF_5.BrI^-_2, OCN^-\)
(C) \(OCN^-, IF_5, BrI^-_2\)
(D) \(OCN^-, BrI^-_2, IF_5\)
The alveoli in human lung are 
(A) 3 crore
(B) 300 million
(C) 350,000
(D) 5 lakhs
Polycythaemia is 
(A) WBC increase
(B) RBC increase
(C) Platelet increase
(D) All of the above

Load More