MCQ
The unit of specific resistance is
- A$Ohm/c{m^2}$
- B$Ohm/cm$
- ✓$Ohm - cm$
- D${(Ohm - cm)^{ - 1}}$
✓
Answer
Correct option: C.
$Ohm - cm$
c
(c) $R = \rho \frac{L}{A} \Rightarrow \rho = \frac{{RA}}{L} = ohm \times cm$
(c) $R = \rho \frac{L}{A} \Rightarrow \rho = \frac{{RA}}{L} = ohm \times cm$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A motor-car tyre has a pressure of $2\, atm$ at $27\,^oC$. It suddenly burst's. If $\left( {\frac{{{C_p}}}{{{C_v}}}} \right) = 1.4$ for air, find the resulting temperatures (Given $4^{1/7} = 1.219$)
→Consider the following equation of Bernouilli’s theorem. $P + \frac{1}{2}\rho {V^2} + \rho gh = K$ (constant)The dimensions of $K/P$ are same as that of which of the following
→It is hotter at the some distance over the top of a fire than it is on the side of it mainly because:
The string of a pendulum of length $l$ is displaced through $90^o$ from the vertical and released. Then, the minimum strength of the string in order to withstand the tension as the pendulum passes through the mean position is
→If the velocity of a particle is $(10 + 2t^2) m/s$, then the average acceleration of the particle between $2s$ and $5s$ is..........$m/s^2$
→Two satellites $A$ and $B$ of masses $200\, kg$ and $400\, kg$ are revolving round the earth at height of $600\, km$ and $1600\, km$ respectively. If $T _{ A }$ and $T _{ B }$ are the time periods of $A$ and $B$ respectively then the value of $T _{ B }- T _{ A }$
→[Given : radius of earth $=6400\, km$, mass of earth $=6 \times 10^{24}\, kg$ ]
A particle of mass $m_1$ is moving with a velocity $v_1$ and another particle of mass $m_2$ is moving with a velocity $v_2$ . Both of them have the same momentum but their different kinetic energies are $E_1$ and $E_2$ respectively. If $m_1 > m_2$ then
→A body of mass m having an initial velocity $v$, makes head on collision with a stationary body of mass $M$. After the collision, the body of mass $m$ comes to rest and only the body having mass $M$ moves. This will happen only when
→The wavelength difference of light waves of wave numbers $2 \times 10^6 / m$ and $2.25 \times 10^6 / m$ is
→Figure shows $ABCDEF$ as a regular hexagon. What is the value of $\overrightarrow {AB} + \overrightarrow {AC} + \overrightarrow {AD} + \overrightarrow {AE} + \overrightarrow {AF} $ (in $\overrightarrow {AO} $)
→