MCQ
In an $L R$-circuit, time constant is that time in which current grows from zero to the value (where $I_0$ is the steady state current)
- A(a) $0.63 I_0$
- B(b) $0.50 I_0$
- ✓(c) $0.37 I_0$
- D(d) $I_0$
✓
Answer
Correct option: C.
(c) $0.37 I_0$
(c)$\begin{aligned}& i=\frac{V}{R}=\frac{10}{2}=5 \mathrm{~A} \\& U=\frac{1}{2} L i^2=\frac{1}{2} \times 2 \times 25=25 \mathrm{~J}\end{aligned}$
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
In X-ray spectrum wavelength $\lambda$ of line $K_\alpha$ depends on atomic number $Z$ as
→The minimum wavelength of the $X$-rays produced by electrons accelerated through a potential difference of $V$ volts is directly proportional to
→When heat is given to a gas in an isothermal change, the result will be
For the production of $X$-rays, the target should be made of
→Two satellite $A$ and $B$, ratio of masses $3: 1$ are in circular orbits of radii $r$ and $4 r$. Then ratio of total mechanical energy of $A$ to $B$ is
→Transverse waves can propagate in
A planet has twice the radius but the mean density is $\frac{1}{4} t h$ as compared to earth. What is the ratio of escape velocity from earth to that from the planet
→A star emits light of $5500 \mathring A$ wavelength. Its appears blue to an observer on the earth, it means
→Three rods of same dimensions are arranged as shown in figure they have thermal conductivities $K_1, K_2$ and $K_3$ The points $P$ and $Q$ are maintained at different temperatures for the heat to flow at the same rate along $P R Q$ and $P Q$ then which of the following option is correct
→Pick out the longest wavelength from the following types of radiations