JEE Mains · Physics · STD 12 - 2. Electric potential and capacitance
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: In electrostatics, a conductor does not store any net charge inside.
Reason R: Inside the capacitor (with no dielectric medium), the free charge carriers, if placed between the plates of capacitor, experience force and drift.
Choose the correct answer from the options given below
- A Both A and R are true and R is the correct explanation of A
- B Both A and R are true but R is NOT the correct explanation of A
- C A is true but R is false
- D A is false but R is true
Answer & Solution
Correct Answer
(B) Both A and R are true but R is NOT the correct explanation of A
Step-by-step Solution
Detailed explanation
In electrostatics, the electric field inside a conductor is zero. According to Gauss's law, \(\oint \vec{E} \cdot d\vec{s} = \dfrac{q_{in}}{\epsilon_0}\). Since \(\vec{E} = 0\) everywhere inside the conductor, the net charge enclosed \(q_{in}\) must be zero. Thus, a conductor…
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
- As show in the figure, in steady state, the charge stored in the capacitor is....... \(\times 10^{-6}\,C\).
JEE Mains 2022 Hard - A spaceship of mass \(2 \times 10^4\,kg\) is launched into a circular orbit close to the earth surface. The additional velocity to be imparted to the spaceship in the orbit to overcome the gravitational pull will be \(......\) (if \(g =10\,m / s ^2\) and radius of earth \(=6400\,km\) )JEE Mains 2023 Medium
- The driver sitting inside a parked car is watching vehicles approaching from behind with the help of his side view mirror, which is a convex mirror with radius of curvature \(\mathrm{R}=2 \mathrm{~m}\). Another car approaches him from behind with a uniform speed of \(90 \mathrm{~km} / \mathrm{hr}\). When the car is at a distance of 24 m from him, the magnitude of the acceleration of the image of the car in the side view mirror is ' a '. The value of 100 a is _______ \(\mathrm{m} / \mathrm{s}^2\).JEE Mains 2025 Hard
- A person observes two moving trains, '\(A\)' reaching the station and '\(B\)' leaving the station with equal speed of \(30\,m / s\). If both trains emit sounds with frequency \(300\,Hz\), (Speed of sound : \(330\,m / s\) ) approximate difference of frequencies heard by the person will be \(..........Hz\)JEE Mains 2023 Medium
- A rigid massless road of length \(3l\) has tow masses attached at each end as shown in the figure. The rod is pivoted at point \(P\) on the horizontal axis (see figure). When released from initial horizontal position, its instantaneous angular acceleration will be
JEE Mains 2019 Hard - An electric dipole of mass m, charge q, and length \(l\) is placed in a uniform electric field \(\overrightarrow{\mathrm{E}}=\mathrm{E}_0 \hat{i}\). When the dipole is rotated slightly from its equilibrium position and released, the time period of its oscillations will be:JEE Mains 2025 Medium
More PYQs from JEE Mains
- If \(\lim _{x \rightarrow 0} \frac{a x^2 e^x-b \log _e(1+x)+c x e^{-x}}{x^2 \sin x}=1\), then \(16\left(a^2+b^2+c^2\right)\) is equal to ...........JEE Mains 2024 Hard
- A uniformly charged ring of radius \(3a\) and total charge \(q\) is placed in \(xy-\) plane centered at origin. A point charge \(q\) is moving towards the ring along the \(z-\) axis and has speed \(v\) at \(z = 4a\). The minimum value of \(v\) such that it crosses the origin isJEE Mains 2019 Hard
- The mean and the standard deviation (s.d.) of \(10\) observations are \(20\) and \(2\) resepectively. Each of these \(10\) observations is multiplied by \(\mathrm{p}\) and then reduced by \(\mathrm{q}\), where \(\mathrm{p} \neq 0\) and \(\mathrm{q} \neq 0 .\) If the new mean and new s.d. become half of their original values, then \(q\) is equal toJEE Mains 2020 Hard
- A circular disc \(D_1\) of mass \(M\) and radius \(R\) has two identical discs \(D_2\) and \(D_3\) of the same mass \(M\) and radius \(R\) attached rigidly as its opposite ends (see figure). The moment of inertia of the system about the axis \(OO\)’, passing through the centre of \(D_1\) as shown in the figure, will
JEE Mains 2019 Hard - In an experiment to find \(emf\) of a cell using potentiometer, the length of null point for a cell of emf \(1.5\,V\) is found to be \(60\,cm\). If this cell is replaced by another cell of \(emf\; E\). the length-of null point increases by \(40\,cm\). The value of \(E\) is \(\frac{x}{10} V\). The value of \(x\) is \(............\)JEE Mains 2023 Medium
- The equation of the plane containing the line \(2x- 5y+ z = 3; x +y+ 4z = 5,\) and parallel to the plane, \(x + 3y+ 6z = 1,\) is:JEE Mains 2015 Medium