JEE Mains · Physics · STD 12 - 3. current electricity
Which of the following statements is false?
- A Wheatstone bridge is the most sensitive when all the four resistances are of the same order of magnitude
- B In a balanced wheatstone bridge if the cell and the galvanometer are exchanged, the null point is disturbed.
- C A rheostat can be used as a potential divider
- D Kirchhoff's second law represents energy conservation
Answer & Solution
Correct Answer
(B) In a balanced wheatstone bridge if the cell and the galvanometer are exchanged, the null point is disturbed.
Step-by-step Solution
Detailed explanation
There is no change in null point, if the cell and the galvanometer are exchanged in a balanced wheatstone birdge.
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
- A body of mass \(5 \mathrm{~kg}\) moving with a uniform speed \(3 \sqrt{2} \mathrm{~ms}^{-1}\) in \(\mathrm{X}-\mathrm{Y}\) plane along the line \(\mathrm{y}=\mathrm{x}+4\).The angular momentum of the particle about the origin will be _______ \(\mathrm{kg}\ \mathrm{m} \mathrm{s}^{-1}\).JEE Mains 2024 Hard
- A proton, a deuteron and an \(\alpha\) particle are moving with same momentum in a uniform magnetic field. The ratio of magnetic forces acting on them is.......... and their speed is.................. in the ratio.JEE Mains 2021 Hard
- Conductor wire ABCDE with each \(\operatorname{arm} 10 \mathrm{~cm}\) in length is placed in magnetic field of \(\frac{1}{\sqrt{2}}\) Tesla, perpendicular to its plane. When conductor is pulled towards right with constant velocity of \(10 \mathrm{~cm} / \mathrm{s}\), induced emf between points A and E is _____ mV.
JEE Mains 2025 Hard - In an ammeter, \(5 \%\) of the main current passes through the galvanometer. If resistance of the galvanometer is G, the resistance of ammeter will be _______.JEE Mains 2024 Hard
- A gas mixture consists of \(2\) moles of oxygen and 4 moles of neon at temperature \(T\). Neglecting all vibrational modes, the total internal energy of the system will be \(...........\,RT\)JEE Mains 2023 Medium
- A polyatomic ideal gas has \(24\) vibrational modes. What is the value of \(\gamma\) ?JEE Mains 2021 Hard
More PYQs from JEE Mains
- A body is moving with constant speed, in a circle of radius \(10 m\). The body completes one revolution in \(4 s\). At the end of \(3 rd\) second, the displacement of body (in \(m\) ) from its starting point is:JEE Mains 2023 Medium
- As shown in the figure, a combination of a thin plano concave lens and a thin plano convex lens is used to image an object placed at infinity. The radius of curvature of both the lenses is \(30\,cm\) and refraction index of the material for both the lenses is \(1.75\). Both the lenses are placed at distance of \(40\,cm\) from each other. Due to the combination, the image of the object is formed at distance \(x =..........cm\), from concave lens.
JEE Mains 2023 Hard - A uniform wire of length \(l\) of weight \(w\) is suspended from the roof with a weight of \(W\) at the other end. The stress in the wire at \(\dfrac{l}{3}\) distance from the top is \(\left(\dfrac{W}{A} + \dfrac{2}{\gamma}\dfrac{w}{A}\right)\), where, \(A\) is the cross sectional area of the wire. The value of \(\gamma\) is _______.JEE Mains 2026 Medium
- A particle executes \(S.H.M.\) of amplitude A along \(x\)-axis. At \(t =0\), the position of the particle is \(x=\frac{A}{2}\) and it moves along positive \(x\)-axis the displacement of particle in time \(t\) is \(x=A \sin (\omega t+\delta)\), then the value \(\delta\) will beJEE Mains 2023 Medium
- 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
- The number of real roots of the equation \(5 + |2^x - 1| = 2^x(2^x - 2)\) isJEE Mains 2019 Hard