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Figure shows a uniform circular loop of radius ‘a’ having specific resistance `rho` placed in a uniform magnetic fieldB perpendicular to plane of figure. A uniform rod of length 2a & resistance R moves with a velocity v as shown.Find the current in the rod when it has moved a distance `a/2` from the centre of circular loop.[Given `B=sqrt3,a=2,v=3,rho=9/(4pi), R=2sqrt3` all in SI

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

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If the magnetic field is parallel to the positive y-axis and the charged particle is moving along the positive x-axis (Fig. ), which way would the Lorentz force be for an electron (negative

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

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If the magnetic field is parallel to the positive y-axis and the charged particle is moving along the positive x-axis (Fig. ), which way would the Lorentz force be for a proton (positive

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

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What is the radius of the path of an electron (mass 9 × 10-31 kg and charge 1.6 × 10–19 C) moving at a speed of 3 ×107 m/s in a magnetic field of 6 × 10–4 T perpendicular to it? What is its frequency? Calculate its energy in keV. ( 1 eV = 1.6 × 10–19

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

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A cyclotron’s oscillator frequency is 10 MHz. What should be the operating magnetic field for accelerating protons? If the radius of its ‘dees’ is 60 cm, what is the kinetic energy (in MeV) of the proton beam produced by the accelerator. (e =1.60 × 10–19 C, mp = 1.67 × 10–27 kg, 1 MeV = 1.6 × 10–13

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

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An element ∆ =` ∆x hat i` is placed at the origin and carries a large current I = 10 A (Fig.). What is the magnetic field on the y-axis at a distance of 0.5 m. ∆x = 1

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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Consider a tightly wound 100 turn coil of radius 10 cm, carrying a current of 1 A. What is the magnitude of the magnetic field at the centre of the

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

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Fig. shows a long straight wire of a circular cross-section (radius a) carrying steady current I. The current I is uniformly distributed across this cross-section. Calculate the magnetic field in the region r < a and r >

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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The horizontal component of the earth’s magnetic field at a certain place is 3.0 ×10–5 T and the direction of the field is from the geographic south to the geographic north. A very long straight conductor is carrying a steady current of 1A. What is the force per unit length on it when it is placed on a horizontal table and the direction of the current is(i) east to west;(ii) south to

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

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A 100 turn closely wound circular coil of radius 10 cm carries a current of 3.2 A.(i) What is the field at the centre of the coil?(ii) What is the magnetic moment of this coil? The coil is placed in a vertical plane and is free to rotate about a horizontal axis which coincides with its diameter. A uniform magnetic field of 2T in the horizontal direction exists such that initially the axis of the coil is in the direction of the field. The coil rotates through an angle of 90° under the influence of the magnetic field.(iii) What are

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

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A current-carrying circular loop lies on a smooth horizontal plane. Can a uniform magnetic field be set up in such a manner that the loop turns around itself (i.e., turns about the vertical

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

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A current-carrying circular loop is located in a uniform external magnetic field. If the loop is free to turn, what is its orientation of stable equilibrium? Show that in this orientation, the flux of the total field (external field + field produced by the loop) is

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

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A loop of irregular shape carrying current is located in an external magnetic field. If the wire is flexible, why does it change to a circular

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In the circuit (Fig. ) the current is to be measured. What is the value of the current if the ammeter shown(i) is a galvanometer with a resistance RG = 60.00 Ω;(ii) is a galvanometer described in (a) but converted to an ammeter by a shunt resistance r s = 0.02 Ω;(iii) is an ideal ammeter with zero

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

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A circular coil of wire consisting of 100 turns, each of radius 8.0 cm carries a current of 0.40 A. What is the magnitude of the magnetic field B at the centre of the

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A long straight wire carries a current of 35 A. What is the magnitude of the field B at a point 20 cm from the

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

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A long straight wire in the horizontal plane carries a current of 50 A in north to south direction. Give the magnitude and direction of B at a point 2.5 m east of the

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

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