AP EAMCET · PHYSICS · Magnetic Effects of Current
A wire shaped in a regular hexagon of side 2 cm carries a current of 4A. The magnetic field at the centre of hexagon is
- A \(4 \sqrt{3} \times 10^{-5} \mathrm{~T}\)
- B \(8 \sqrt{3} \times 10^{-5} \mathrm{~T}\)
- C \(\sqrt{3} \times 10^{-5} \mathrm{~T}\)
- D \(6 \sqrt{3} \times 10^{-5} \mathrm{~T}\)
Answer & Solution
Correct Answer
(B) \(8 \sqrt{3} \times 10^{-5} \mathrm{~T}\)
Step-by-step Solution
Detailed explanation
\(\mathrm{r}=\frac{\frac{\mathrm{a}}{2}}{\tan 30^{\circ}}=\frac{\sqrt{3} \mathrm{a}}{2}=\sqrt{3} \mathrm{~cm}\) \(\therefore\) Magnetic field at centre 0 ,…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from PHYSICS
- In the following common emitter circuit, if \(\beta=100, V_{C E}=-7 \mathrm{~V}, V_{B E}\) is negligible, \(R_C=2 \mathrm{k} \Omega\), then \(I_B=\) ?
AP EAMCET 2021 Medium - Block \(A\) of mass \(100 \mathrm{~kg}\) is kept above another block \(B\) of mass \(300 \mathrm{~kg}\). \(A\) is tied to the wall \(C\) with a horizontal string. The coefficient of friction between \(A\) and \(B\) is 0.35 and that between \(B\) and the horizontal surface is 0.5 . Find the horizontal force \(p\), necessary to move the block \(B\).
AP EAMCET 2021 Hard - Two point charges \(-q\) and \(+q\) are located at points \((0,0,-a)\) and \((0,0, a)\) respectively. The electric potential at a point \((0,0, z)\), where \(z>a\) isAP EAMCET 2009 Medium
- A TV tower has a height \(160 \mathrm{~m}\). Its coverage range is nearly (Earth's radius, \(R_e=6400 \mathrm{~km}\))AP EAMCET 2019 Easy
- Assertion (A) : It is more difficult to push a magnet into a coil with more number of turns.
Reason (R) : The emf induced in a coil opposes the motion of a magnet when it is moved towards the coil.AP EAMCET 2017 Easy - The centripetal acceleration ' \(a\) ' of an electron in an orbit of hydrogen and the principal quantum number ' \(n\) ' of the orbit are related byAP EAMCET 2023 Easy
More PYQs from AP EAMCET
- The figure formed by the four points \((\hat{\mathbf{i}}+\hat{\mathbf{j}}-\hat{\mathbf{k}}),(2 \hat{\mathbf{i}}+3 \hat{\mathbf{j}}),(5 \hat{\mathbf{j}}-2 \hat{\mathbf{k}})\) and \((\hat{\mathbf{k}}-\hat{\mathbf{j}})\) isAP EAMCET 2021 Easy
- If the most probable speed of methane at a certain temperature is \(400 \mathrm{~ms}^{-1}\), the kinetic energy of one mole of methane at the same temperature in \(\mathrm{J}\) is మీథేన్ గతిజశక్తి J లలోAP EAMCET 2018 Medium
- A thin uniform rod of length \(L\) is resting against a wall and the floor as shown in the figure. Its lower end \(A\) is pulled towards left with a constant velocity \(v\). Then the downward velocity \(v^{\prime}\) of the other end \(B\) when the rod makes an angle \(\theta\) with the floor is
AP EAMCET 2019 Hard - If \(\mathrm{a}, \mathrm{b}, \mathrm{c}\) are non-zero real numbers and if the equations \((a-1) x=y+z,(b-1) y=z+x,(c-1) z=x+y\) have a non-trivial solution, then \(a b+b c+c a=\)AP EAMCET 2017 Medium
- Two soap bubbles combine to form a single bubble. In this process, the change in volume and surface area are respectively \(V\) and \(A\). If \(P\) is the atmospheric pressure, and \(T\) is the surface tension of the soap solution, the following relation is true :AP EAMCET 2006 Hard
- An observer is standing \(500 \mathrm{~m}\) away from a vertical hill. Starting between the observer and the hill, a police van sounding a siren of frequency \(1000 \mathrm{~Hz}\) moves towards the hill with a uniform speed. If the frequency of the sound heard directly from the siren is \(970 \mathrm{~Hz}\), the frequency of the sound heard after reflection from the hill (in Hz) is about, (velocity of sound \(=330 \mathrm{~ms}^{-1}\) ) :AP EAMCET 2006 Hard