JEE Mains · Physics · STD 12 - Electric charges and fields
- JEE Mains 2023
- Medium
- MCQ
Given below are two statement: one is labelled as Assertion \(A\) and the other is labelled as Reason \(R\). Assertion \(A:\) If an electric dipole of dipole moment \(30 \times 10^{-5}\,Cm\) is enclosed by a closed surface, the net flux coming out of the surface will be zero. Reason \(R\) : Electric dipole consists of two equal and opposite charges. In the light of above, statements, choose the correct answer from the options given below:
Pick an option to check your answer.
Answer & Solution
Correct Answer
(A) Both \(A\) and \(R\) are true and \(R\) is the correct explanation of \(A\)
Step-by-step Solution
Detailed explanation
\(\overrightarrow{ P }=30 \times 10^{-5}\,Cm\)
Using Gauss law
\(\phi=\frac{Q_{\text {in }}}{\varepsilon_0} \text { and } Q_{\text {in }}=0\)
\(\Rightarrow \phi=0\)
Statement \(1\) and Statement \(2\) are correct.
More questions from Physics
- Match List \(- I\) with List \(- II\)
Choose the correct answer from the options given below:List\(-I\) (Layer of atmosphere) List\(-II\) (Approximate height over earth's surface) \((A)\) \(F_1\) - Layer \((I)\) \(10\,km\) \((B)\) \(D-\) Layer \((II)\) \(170-190\,km\) \((C)\) Troposphere \((III)\) \(100\,km\) \((D)\) \(E-\)layer \((IV)\) \(65-75\,km\) JEE Mains 2023 Medium - In an experiment for determining the gravitational acceleration \(g\) of a place with the help of a simple pendulum, the measured time period square is plotted against the string length of the pendulum in the figure. What is the value of \(g\) at the place? ...... \(m/s^2\)
JEE Mains 2014 Medium - Given below are two statements; one is labelled as Assertion \(A\) and the other is labelled as Reason \(R\). Assertion \(A:\) Electromagnets are made of soft iron. Reason \(R:\) Soft iron has high permeability and low retentivity. In the light of above, statements, choose the most appropriate answer from the options given below.JEE Mains 2023 Medium
- A current of \(5\; {A}\) is passing through a non-linear magnesium wire of cross-section \(0.04\; {m}^{2}\). At every point the direction of current density is at an angle of \(60^{\circ}\) with the unit vector of area of cross-section. The magnitude of electric field at every point of the conductor is ....\({V} / {m}\) (Resistivity of magnesium is \(\rho=44 \times 10^{-8}\, \Omega m\))JEE Mains 2021 Hard
- A thin disc of mass \(M\) and radius \(R\) has mass per unit area \(\sigma (r) = kr^2\) where \(r\) is the distance from its centre. Its moment of inertia about an axis going through its centre of mass and perpendicular to its plane isJEE Mains 2019 Hard
- Consider a circular disc of radius 20 cm with centre located at the origin. A circular hole of radius 5 cm is cut from this disc in such a way that the edge of the hole touches the edge of the disc. The distance of centre of mass of residual or remaining disc from the origin will be ________.JEE Mains 2025 Medium
More PYQs from JEE Mains
- A gas mixture consists of \(8\) moles of argon and \(6\) moles of oxygen at temperature \(T\). Neglecting all vibrational modes, the total internal energy of the system is _______.JEE Mains 2024 Hard
- The four arms of a Wheatstone bridge have resistances as shown in the figure. A galvanometer of \(15\, \Omega\) resistance is connected across \(BD\). Calculate the current through the galvanometer when a potential difference of \(10\, V\) is maintained across \(AC.\)
JEE Mains 2021 Hard