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A charged particle with some initial velocity is projected in a region where non-zero electric and/or magnetic field(s) are present.In Column I, information about the existence of electric and/or magnetic field(s) and direction of initial velocity of charged particle are given, while in Column II the probable path of the charged particle is mentioned. Match the entries of Column I with the entries of Column II and select the correct answer from the codes given below. Column I Column II A. `E=0, B!=0, E!= B` and initial velocity is at any angle with `B (theta!=90°)`

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

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Electron Moving in Magnetic Field An electron with a speed `v_0 ( < < c)` moves in a circle of radius `r_0`, in a uniform magnetic field. This electron is able to travel in a circular path as magnetic field is perpendicular to the velocity of the electron. The time required for one revolution of the electron is `T_0`. The speed of the electron is now, doubled to `2v_0`.A charged particle is projected in a magnetic field `B=(2hati + 4 hatj) xx 10^2 T`. The acceleration of the particle is found to be `a=(xhati + 2hatj)ms^(-2)`. Find the value of

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

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Moving Coil GalvanometerMoving coil galvanometer operates on Permanent Magnet Moving Coil (PMMC) mechanism and was designed by the scientist D’arsonval.Moving coil galvanometers are of two types (i) Suspended coil (ii) Pivoted coil type or tangent galvanometer.Its working is based on the fact that when a current carrying coil is placed in a magnetic field, it experiences a torque. This torque tends to rotate the coil about its axis of suspension in such a way that the m agnetic flux passing through the coil is maximum .A moving coil galvanometer is an instrument,

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

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At a place in magnetic meridian, magnetic needle bends 30° from horizontal. If earth’s magnetic field at this place is 2 G, then vertical component and horizontal component of earth’s magnetic field respectively,

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

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Earth’s Magnetic FieldThe magnetic field lines of the earth resemble that of a hypothetical magnetic dipole located at the centre of the earth. The axis of the dipole is presently tilted by approximately 11.3° with respect to the axis of rotation of the earth.The pole near the geographic north pole of the earth is called the north magnetic pole and the pole near the geographic south pole is called south magnetic pole.The value of angle of dip is zero at the magnetic equator because on

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

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Assertion: When a metallic conductor is moved in and out in a magnetic field, then an induced emf is produced across it. Reason: Eddy current will not be produced in a metallic surface moving in and out of magnetic

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

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Induced CurrentThe steady current in the coil `C_2` as shown below produces a steady magnetic field. As coil `C_2` is moved towards the coil `C_1`, the galvanometer shows a deflection. This indicates that electric current is induced in coil `C_1`. When `C_2` is moved away, the galvanometer shows a deflection again, but this time in the opposite direction. This deflection is based upon the Faraday’s law of electromagnetic induction.When the coil `C_2` is held fixed and `C_1` is moved ,

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Which of the following statements(s) is/are incorrect with respect to tuning

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Which of the following statements is/are incorrect about

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Assertion: Average value of current in half the cycle of an AC circuit cannot be zero. Reason: For positive half cycle average value of current is `(i_0)/pi`, where `i_0` is the peak value

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

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Assertion: If an inductor coil is connected to DC source, the current supplied by it is `I_1`.If the same coil is connected with an AC source of same voltage. Then, current is `I_2`. Then, `I_2 < I_1.` Reason: In AC circuit, inductor coil offers more

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Electrical ResonanceElectrical resonance is said to take place in a series L-C-R circuit when the circuit allows maximum current for a given frequency of the source of alternating supply for which capacitive reactance becomes equal to the inductive reactance. Impedance of this L-C-R circuit is minimum and hence current is maximum. Resonant circuits are used to respond selectively to signals of a given frequency while discriminating against signals of different frequencies. If the response of the circuit is more narrowly peaked around the chosen frequency, we say that the circuit has higher “selectivity or sharpness”. This sharpness is measures with

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

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The Transformer Transformer is a device, which is used to increase or decrease the alternating voltage. The transformers are of the following types (i) Step-up transformer (ii) Step-down transformerTransformer is based upon the principle of mutual induction. It consists of two coils, primary coil `(p)` and secondary coil `(s)`, insulated from each other wounded on soft iron core.Often the primary coil is the input coil and secondary coil is the output coil. These soft iron cores are laminated to minimise eddy current loss.A transformer has 150 turns in its primary and 1000 in secondary. If the primary is connected to

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In what way does the corrective lens help the above person? Does the lens magnify objects held near the

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The above person prefers to remove the spectacles while looking at the sky. Explain

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A small telescope has an objective lens of focal length 144cm and an eyepiece of focal length 6.0cm. What is the magnifying power of the telescope? What is the separation between the objective and the

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A myopic person has been using spectacles of power –1.0 dioptre for distant vision. During old age he also needs to use separate reading glass of power + 2.0 dioptres. Explain what may have

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A concave lens of refractive index 1.5 is immersed in a medium of refractive index 1.65. What is the nature of the

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Trace the path of a ray of light passing through a glass prism ABC as shown in the figure. If the refractive index of glass is `sqrt3`, then find out the value of the angle of emergence from the

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

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A beam of light converges at a point P. A concave lens of focal length 16 cm is placed in the path of this beam 12 cm from P. Draw a ray diagram and find the location of the point at which the beam would now

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

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