MCQ
The linear charge density on upper half of a segment of ring is $\lambda$ and at lower half, it is $-\lambda$. The direction of electrical field at centre $O$ of ring is :-
- Aalong $OA$
- Balong $OB$
- ✓along $OC$
- Dalong $OD$
✓
Answer
Correct option: C.
along $OC$
c
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
An earth satellite is moved from one stable circular orbit to another larger and stable circular orbit. The following quantities increase for the satellite as a result of this change
The half-life of radium is about $1600$ years. Of $100\, g$ of radium existing now, $25\, g$ will remain unchanged after .......... $years$
→A uniformly charged disc of radius $R$ having surface charge density $\sigma$ is placed in the ${xy}$ plane with its center at the origin. Find the electric field intensity along the $z$-axis at a distance $Z$ from origin :-
→A beam of light $A O$ is incident on a glass slab $(m=1.54)$ in a direction as shown in the diagram. The reflected ray $O B$ is passed through a polariod. On viewing through the polariod, we find that on rotating the polariod $\left(\right.$ Given $\left.\tan 57^{\circ}=1.54\right)$
→The fundamental frequency of a sonometer wire increases by $6$ $Hz$ if its tension is increased by $44\%$ keeping the length constant. The change in the fundamental frequency of the sonometer wire in $Hz$ when the length of the wire is increased by $20\%$, keeping the original tension in the wire will be :-
→A hydrogen atom changes its state from $n=3$ to $\mathrm{n}=2$. Due to recoil, the percentage change in the wave length of emitted light is approximately $1 \times 10^{-\mathrm{n}}$. The value of $\mathrm{n}$ is_______.[Given $\mathrm{Rhc}=13.6 \mathrm{eV}, \mathrm{hc}=1242 \mathrm{eV} \mathrm{nm}$, $\mathrm{h}=6.6 \times 10^{-34} \mathrm{~J} \mathrm{~s}$, mass of the hydrogen atom $\left.=1.6 \times 10^{-27} \mathrm{~kg}\right]$
→Angular momentum of a single particle moving with constant speed along circular path:
In given diagram apparent velocity of bird (coming toward fish) seen by fish is $19\, cm/s$. Find the actual velocity of bird......$cm/s$
→If the radius of a soap bubble is four times that of another, then the ratio of their excess pressures will be
A parallel plate capacitor is charged to a potential difference of $100\,V$ and disconnected from the source of $emf$ . A slab of dielectric is then inserted between the plates. Which of the following three quantities change?
→$(i)$ The potential difference
$(ii)$ The capacitance
$(iii)$ The charge on the plates