The potential difference in open circuit for a cell is 2.2 , volt… - Vidyadip

MCQ

The potential difference in open circuit for a cell is $2.2\, volts$. When a $4\, ohm$ resistor is connected between its two electrodes the potential difference becomes $2\, volts$. The internal resistance of the cell will be .............. $ohm$

A
$1$
B
$0.2$
C
$2.5$
✓
$0.4$

✓

Answer

Correct option: D.

$0.4$

d
$(4 + r)i = 2.2$ ...... $(i)$

and $4i = 2$ $ \Rightarrow $ $i = \frac{1}{2}$

Putting the value of $i$ in $(i)$, we get $r = 0.4\, ohm$.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

JEE STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

The identical metal plates with large surface areas are kept parallel to each other as shown in figure. The left most plate is given a charge $Q$ , the rightmost a charge $-2Q$ and the middle one remains neutral. Find the charge appearing on the outer surface of the rightmost plate

A parallel plate condenser with oil between the plates (dielectric constant of oil $K = 2$) has a capacitance $C$. If the oil is removed, then capacitance of the capacitor becomes

A metal wire having Poisson's ratio $1 / 4$ and Young's modulus $8 \times 10^{10} \,N / m ^2$ is stretched by a force, which produces a lateral strain of $0.02 \%$ in it. The elastic potential energy stored per unit volume in wire is $[$in $J / m ^3]$

A capacitor is made of two square plates each of side $a$ making a very small angle $\alpha$ between them, as shown in figure. The capacitance will be close to

$Assertion$ : If collision occurs between two elastic bodies their kinetic energy decreases during the time of collision.

$Reason$ : During collision intermolecular space decreases and hence elastic potential energy increases.

An athlete completes one round of a circular track of radius $R$ in $40 \,sec$. What will be his displacement at the end of $2 \,min$. $20 \,sec$

What will be the input of $A$ and $B$ for the Boolean expression $\overline {(A + B)} \, \cdot \,\overline {(A \cdot B)} = 1$

A parallel plate capacitor with plate area $'A'$ and distance of separation $'d'$ is filled with a dielectric. What is the capacity of the capacitor when permittivity of the dielectric varies as :

$\varepsilon(x)=\varepsilon_{0}+k x, \text { for }\left(0\,<\,x \leq \frac{d}{2}\right)$

$\varepsilon(x)=\varepsilon_{0}+k(d-x)$, for $\left(\frac{d}{2} \leq x \leq d\right)$

A body of mass $1\, kg$ rests on a horizontal floor with which it has a coefficient of static friction $\frac{1}{\sqrt{3}}$. It is desired to make the body move by applying the minimum possible force $F\, N$. The value of $F$ will be the Nearest Integer) [Take $g =10 \,ms ^{-2}$ ]

Venus looks brighter than other planets because