TS EAMCET · Physics · Magnetic Effects of Current
A straight wire of mass \(0.2 \mathrm{~kg}\) and length \(1.5 \mathrm{~m}\) carries a current \(2 \mathrm{~A}\) is shown in the figure. It is suspended in mid-air by a uniform magnetic field \(B\) pointing to the plane of paper. The magnitude of magnetic field is (ignore, earth's magnetic field and assume \(g=10 \mathrm{~m} / \mathrm{s}^2\) )
- A \(0.55 \mathrm{~T}\)
- B \(0.67 \mathrm{~T}\)
- C \(0.75 \mathrm{~T}\)
- D \(0.85 \mathrm{~T}\)
Answer & Solution
Correct Answer
(B) \(0.67 \mathrm{~T}\)
Step-by-step Solution
Detailed explanation
Given, mass of the wire, \(m=0.2 \mathrm{~kg}\) Length of the wire, \(l=1.5 \mathrm{~m}\) Current, \(I=2 \mathrm{~A}\) The force acting on the current carrying wire in uniform magnetic field, \(=I B l \sin \theta\)…
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 a transistor circuit, when the base current is increased by 50 micro-amperes keeping the collector voltage fixed at 2 volts, the collector current increases by \(1 \mathrm{~mA}\). The current gain of the transistor isTS EAMCET 2002 Easy
- In Young's double slit experiment, first slit has width four times the width of the second slit. the ratio of the maximum intensity to the minimum intensity in the interference fringe system is :TS EAMCET 2006 Easy
- From a uniform circular disc of radius \(2 \mathrm{~cm}\) (its centre of mass is at \(O\) ) a circular portion of radius \(1 \mathrm{~cm}\) is removed such that the shift in centre of mass is maximum. The disc is now rotated by an angle \(\theta\) about an axis perpendicular to its plane and passing through \(O\). If the magnitude of displacement of new centre of mass is \(\frac{1}{\sqrt{3}} \mathrm{~cm}\), then the \(\theta\) isTS EAMCET 2020 Hard
- A source of sound of frequency \(640 \mathrm{~Hz}\) is moving at a velocity of \(\frac{100}{3} \mathrm{~m} / \mathrm{s}\) along a road, and is at an instant \(30 \mathrm{~m}\) away from a point \(A\) on the road (as shown in figure). A person standing at \(O, 40 \mathrm{~m}\) away from the road hears sound of apparent frequency \(v^{\prime}\). The value of \(v^{\prime}\) is (velocity of sound \(=340 \mathrm{~m} / \mathrm{s}\) )
TS EAMCET 2013 Hard - A body falls freely from a height ' \(\mathrm{h}\) ' on a fixed horizontal plane and rebounds. If ' \(\mathrm{e}\) ' is the coefficient of restitution, the total distance travelled before it comes to rest isTS EAMCET 2023 Medium
- If a radioactive substance decays \(10 \%\) in every 16 hours, then the percentage of the radioactive substance that remains after 2 days isTS EAMCET 2025 Medium
More PYQs from TS EAMCET
- An ideal gas is subjected to cyclic process involving four thermodynamic states, the amounts of heat \((Q)\) and work \((W)\) involved in each of these states are \(\begin{aligned} & Q_1=6000 \mathrm{~J}, \quad Q_2=-5500 \mathrm{~J} ; Q_3=-3000 \mathrm{~J} ; \ & Q_4=3500 \mathrm{~J} \ & W_1=2500 \mathrm{~J} ; \quad W_2=-1000 \mathrm{~J} ; \quad W_3=-1200 \mathrm{~J} ; \ & W_4=x \mathrm{~J} . \end{aligned}\) The ratio of the net work done by the gas to the total heat absorbed by the gas is \(\eta\). The values of \(x\) and \(\eta\) respectively areTS EAMCET 2009 Medium
- The drift speed of electrons in a material is found to be \(0.3 \mathrm{~ms}^{-1}\) when an electric field of \(2 \mathrm{Vm}^{-1}\) is applied across it. The electron mobility (in \(\mathrm{m}^2 \mathrm{~V}^{-1} \mathrm{~s}^{-1}\) ) in the material isTS EAMCET 2025 Easy
- A metal cooking pot has a base area of \(0.2 \mathrm{~m}^2\) and thickness \(2.0 \mathrm{~cm}\). It boils water at a rate of \(3.0 \mathrm{~kg} / \mathrm{min}\) when placed on a hot plate. The temperature of the part of the lot plate in contact with the pot is approximately [Thermal conductivity of metal is \(120 \mathrm{Js}^{-1} \mathrm{~m}^{-1} \mathrm{~K}^{-1}\), heat of vaporisation of water is \(2 \times 10^6 \mathrm{~J} / \mathrm{kg}\) ]TS EAMCET 2022 Easy
- A piece of copper and another of germanium are cooled from room temperature to The resistance ofTS EAMCET 2020 Easy
- A cricket player can throw a ball with an initial speed of \(30 \mathrm{~m} / \mathrm{s}\). What is the maximum range of the player can throw the ball? Neglect air resistance. [Take, \(g=10 \mathrm{~m} / \mathrm{s}^2\) ]TS EAMCET 2018 Easy
- The plates of a parallel plate capacitor are charged upto 200 volts. A dielectirc slab of thickness \(4 \mathrm{~mm}\) is inserted between its plates. Then, to maintain the same potential difference between the plates of the capacitor, the distance between the plates is increased by \(3.2 \mathrm{~mm}\). The dielectric constant of the dielectric slab isTS EAMCET 2004 Medium