TS EAMCET · Physics · Magnetic Properties of Matter
The magnetic needle of a vibration magnetometer makes 12 oscillations per minute in the horizontal component of earth's magnetic field. When an external short bar magnet is placed at some distance along the axis of the needle in the same line, it makes 15 oscillations per minute. If the poles of the bar magnet are interchanged, the number of oscillations it makes per minute is
- A \(\sqrt{61}\)
- B \(\sqrt{63}\)
- C \(\sqrt{65}\)
- D \(\sqrt{67}\)
Answer & Solution
Correct Answer
(B) \(\sqrt{63}\)
Step-by-step Solution
Detailed explanation
\(\begin{array}{ll} \text {Ist case } & n=\frac{1}{2 \pi} \sqrt{\frac{M H}{I}} \\ \Rightarrow & n \propto \sqrt{H} \Rightarrow \frac{n_1}{n_2}=\sqrt{\frac{H}{H+H_1}} \\ \Rightarrow \quad & \frac{12}{15}=\sqrt{\frac{H}{H+H_1}} \Rightarrow H_1=\frac{9}{16} H \end{array}\) IInd…
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 block kept on a frictionless horizontal surface is connected to one end of a horizontal spring of constant \(100 \mathrm{Nm}^{-1}\) whose other end is fixed to a rigid vertical wall. Initially the block is at its equilibrium position. The block is pulled to a distance of 8 cm and released. The kinetic energy of the block when it is at a distance of 3 cm from the mean position isTS EAMCET 2024 Easy
- A bouncing ball of mass \(200 \mathrm{~g}\) falls from the height of \(5 \mathrm{~m}\) on a horizontal ground. After every impact with the ground, the velocity of the ball decreases by \(\frac{1}{2}\) times. The total momentum, the ball imparts on to the ground after 3 impacts is \(\left(\right.\) Let \(\left.g=10 \mathrm{~m} / \mathrm{s}^2\right)\)TS EAMCET 2019 Medium
- The temperature difference between the ends of two cylindrical rods \(A\) and \(B\) of the same material is \(2: 3\). In steady state the ratio of the rates of flow of heat through the rods \(A\) and \(B\) is \(5: 9\). If the radii of the rods \(A\) and \(B\) are in the ratio \(1: 2\), then the ratio of lengths of the rods \(A\) and \(B\) isTS EAMCET 2024 Medium
- Two capacitors, and are connected in series across a source. ThenTS EAMCET 2021 Medium
- At a certain place a magnet makes 30 oscillations per minute. At another place where the magnetic field is double, its time period will beTS EAMCET 2012 Hard
- \(A, B, C\) are points in a vertical line such that \(A B=B C\). If a body falls freely from rest at \(A, t_1\) and \(t_2\) are times taken to travel distances \(A B\) and \(B C\), then ratio \(\left(t_2 / t_1\right)\) isTS EAMCET 2015 Medium
More PYQs from TS EAMCET
- The \(L-C-R\) circuit shown below is driven by an ideal AC voltage source.
At frequency \(f=\frac{1}{2 \pi \sqrt{L C}}\), choose the correct statement.TS EAMCET 2020 Easy - The surface of a black body is at a temperature \(727^{\circ} \mathrm{C}\) and its cross-section is \(1 \mathrm{~m}^2\). Heat radiated from this surface in one minute in joules is (Stefan's constant \(=5.7 \times 10^{-8} \mathrm{~W} / \mathrm{m}^2 / \mathrm{k}^4\) )TS EAMCET 2016 Easy
- At absolute zero temperature, a semiconductor behaves likeTS EAMCET 2025 Easy
- In an \(n\)-type semiconductor, electrons are majority charge carriers and holes are minority charge carriers. The charge of an \(n\)-type semiconductor isTS EAMCET 2024 Easy
- An initially charged undriven \(L C R\) circuit having inductance \(L\), capacitance \(C\) and resistance \(R\) will beTS EAMCET 2018 Hard
- A charged particle moves with some initial velocity along the direction of external magnetic field \(B\). Now, if we apply uniform field perpendicular to the magnetic field, then the trajectory of the charged particle will beTS EAMCET 2018 Easy