MCQ
In the given figure, when galvanometer shows no deflection, the current (in $A$) flowing through $5\,\Omega $ resistance will be
- A$0.5$
- ✓$0.6$
- C$0.9$
- D$1.5$
✓
Answer
Correct option: B.
$0.6$
b
Let current through $5\,\Omega $ resistance be $i$.
Let current through $5\,\Omega $ resistance be $i$.
Then $i \times 25 = (2.1 - i)\,10$
$i = \frac{{10}}{{35}} \times 2.1 = 0.6\,A$
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
The ${K_\alpha }$ $X$ - rays arising from a cobalt $(z = 27)$ target have a wavelength of $179\, pm$. The ${K_\alpha }$ $X$ - rays arising from a nickel target $(z = 28)$ is
→A solid sphere moves at a terminal velocity of $20m/s$ in air at a place where $g = 9.8m/s^2.$ The sphere is taken in a gravity free hall having air at the same pressure and pushed down at a speed of $20m/s$
→- Its initial acceleration will be $9.8m/s^2$ downward.
- Its initial acceleration will be $9.8m/s^2$ upward.
- The magnitude of acceleration will decrease as the time passes.
- It will eventually stop.
A $25\,cm$ long solenoid has radius $2\,cm$ and $500$ total number of turns. It carries a current of $15\,A.$ If it is equivalent to a magnet of the same size and magnetization $\vec M$ ( magnetic moment/ volume), then $\left| {\vec M} \right|$ is
→Reverse break down voltage for silicon diode is $6\ V$ for a particular doping concentration and forward break down voltage is $0.3\ V$ then find approximate current through battery in the given circuit....$Amp$
→For given arrangement, where four charge fixed at ends of as quare as given, find value of additional charge $Q$ to be put on one of the vertices so that component of net electric field along the vertical symmetric axis is zero at every point on the vertical
→A prism of refracting angle $60^o$ is made with a material of refractive index $\mu$. For a certain wavelength of light, the angle of minimum deviation is $30^o$. For this, wavelength the value of refractive index of the material is
→The magnetic moment of a bar magnet is $0.5 \mathrm{Am}^2$. It is suspended in a uniform magnetic field of $8 \times 10^{-2} \mathrm{~T}$. The work done in rotating it from its most stable to most unstable position is:
→Assertion : Electric lines of force cross each other.
Reason : Electric field at a point superimpose to give one resultant electric field.
Reason : Electric field at a point superimpose to give one resultant electric field.
Match the List $-I$ (Phenomenon associated with electromagnetic radiation) with List $-II$ (Part of electromagnetic spectrum) and select the correct code from the choices given below this lists
→| List $I$ | List $II$ |
| $I$ Doublet of sodium | $(A)$ Visible radiation |
| $II$ Wavelength corresponding to temperature associated with the isotropic radiation filling all space | $(B)$ Microwave |
| $III$ Wavelength emitted by atomic hydrogen in interstellar space | $(C)$ Short radio wave |
| $IV$ Wavelength of radiation arising from two close energy levels in hydrogen | $(D)$ $X-$ rays |
The figure shows three situations when an electron moves with velocity $\vec v$ travels through a uniform magnetic field $\vec B$. In each case, what is the direction of magnetic force on the electron
→