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An α − particle and a proton are accelerated from rest through same potential difference V. find the ratio of de–broglie wavelength associated with

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A cubical block of iron 5cm on each side is floating on mercury in a vessel:-1) What is the height of the block above mercury level?2) Water is poured into vessel so that it just covers the iron block. What is the height of the water column?Given Density of mercury = 13.6g|`cm^3` and Density of iron =

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Position of a particle in shm is y = 3 sin ( π 2 t + π 4 ) m

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Explain why two field lines never cross each other at any

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A device ‘X’ is connected to an a.c source. The variation of voltage, current and power in one complete cycle is shown in Fig . Identify the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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An LC circuit contains a 20mH inductor and a `50muF` capacitor with an initial charge of 10mC. The resistance of the circuit is negligible. Let the instant the circuit is closed to be `t = 0.`What is the natural frequency of the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The emf across `AB` at `t=l/(2v)` isA conducting square wire frame ABCD of side `l` is pulled by horizontal force so that it moves with constant velocity v. A uniform magnetic field of strength B is existing perpendicular to the plane of wire. The resistance per unit length of wire is `lambda` and negligible self inductance. If at `t= 0,` frame is just at the boundary of magnetic field.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A straight wire of mass 200 g and length 1.5 m carries a current of 2 A. It is suspended in mid-air by a uniform horizontal magnetic field B (Fig.). What is the magnitude of the magnetic

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A straight wire carrying a current of 12 A is bent into a semi-circular arc of radius 2.0 cm as shown in Fig. (a). Consider the magnetic field B at the centre of the arc.(i) What is the magnetic field due to the straight segments?(ii) In what way the contribution to B from the semicircle differs from that of a circular loop and in what way does it resemble?(iii) Would your answer be different if the wire were bent into a semi-circular arc of the same radius but in the opposite way as shown in Fig.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A solenoid of length 0.5 m has a radius of 1 cm and is made up of 500 turns. It carries a current of 5 A. What is the magnitude of the magnetic field inside the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A short bar magnet placed with its axis at 30° with an external field of 800 G experiences a torque of 0.016 Nm.What is the magnitude of the equatorial and axial fields due to a bar magnet of length 5.0 cm at a distance of 50 cm from its mid-point? The magnetic moment of the bar magnet is 0.40 A

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Fig. shows a small magnetised needle P placed at a point O. The arrow shows the direction of its magnetic moment. The other arrows show different positions (and orientations of the magnetic moment) of another identical magnetised needle Q. (i) In which configuration the system is not in equilibrium?(ii) In which configuration is the system in (i) stable, and (ii) unstable equilibrium?(iii) Which configuration corresponds to the lowest potential energy among all the configurations shown?

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In a mass spectrometer used for measuring the masses of ions, the ions are initially accelerated by an ele. potential V and then made to describe semicircular paths of radius R using a magnetic field B.If V and B are kept constant, the ratio Charge on the ion /mass of the ion will be proportional

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Faraday Cage A Faraday cage or Faraday shield is an enclosure made of a conducting material. The fields within a conductor cancel out with any external fields, so the electric field within the enclosure is zero.These Faraday cages act as big hollow conductors. You can put things to shield them from electrical fields. Any electrical shocks the cage receives, pass harmlessly around the outside of the cage. A point charge of 2C is placed at centre of Faraday cage in the shape of cube with surface of 9 cm edge. The number of electric field lines passing through the cube

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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At room temperature `(27.0°C)` the resistance of a heating element is `100 Omega`. What is the temperature of the element, if the resistance is found to be `117 Omega`, given that the temperature coefficient of the material of the resistor is `1.70 xx

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The temperature `(T)` dependence of resistivity `(rho)` of a semiconductor is represented

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Lorentz Force and Its Effects A charged particle moving in an external magnetic field experiences a force, which is called Lorentz force, i.e. `F=q(v xx B)`,where `q` is the charge on the particle and v is the velocity of the particle. The direction of the force is given by the cross product of velocity vector and magnetic field vector at any time.The charge particle travels in a special trajectory called helical path. Because the force is always perpendicular to the velocity vector, the magnetic field can do no work on an isolate charge. Hence, the linear velocity always remains the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Magnetic Field of a SolenoidMohan tightly wound a very long copper wire on a PVC pipe and carefully took the pipe out. The two ends of the copper wire then attached to a battery. This cylindrical shape of copper wire showed few properties of a bar magnet. Later he found that it is called a solenoid and this solenoid is used in several devices such as door bell, relay switch etc. The magnetic field of a solenoid is given below.The magnetic field strength of a solenoid having n turns is `B=mu_0nl`, where, `I` is the current flowing in the solenoid.An

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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L-C Oscillations When a capacitor is supplied with an AC circuit, it gets charged.When this charged capacitor is connected with an inductor, current flows through inductor, giving rise to magnetic flux. Hence, induced emf is produced in the circuit. Due to this, the charge on the capacitor decreases and an equivalent amount of energy is stored in the inductor in the form of magnetic Field.An AC circuit contains a capacitor of capacitance `10^(-6)F` and an inductor of inductance `10^(-4) H`. The frequency of electrical oscillations will

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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AC Generator An AC generator produces electrical energy from mechanical work, just the opposite of what a motor does. In it, a shaft is rotated by some mechanical means, such as an engine or a turbine starts working and an emf is induced in the coil.It is based on the phenomenon of electromagnetic induction which states that whenever magnetic flux linked with a conductor (or coil) changes, an emf is induced in the coil. The graph below shows the voltage output plotted against time. Which point on the graph shows that the coil is in a vertical

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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