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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 >

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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

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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

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

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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

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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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A horizontal overhead power line carries a current of 90 A in east to west direction. What is the magnitude and direction of the magnetic field due to the current 1.5 m below the

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

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What is the magnitude of magnetic force per unit length on a wire carrying a current of 8 A and making an angle of 30º with the direction of a uniform magnetic field of 0.15

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

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A 3.0 cm wire carrying a current of 10 A is placed inside a solenoid perpendicular to its axis. The magnetic field inside the solenoid is given to be 0.27 T. What is the magnetic force on the

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

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Two long and parallel straight wires A and B carrying currents of 8.0 A and 5.0 A in the same direction are separated by a distance of 4.0 cm. Estimate the force on a 10 cm section of wire

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

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A closely wound solenoid 80 cm long has 5 layers of windings of 400 turns each. The diameter of the solenoid is 1.8 cm. If the current carried is 8.0 A, estimate the magnitude of B inside the solenoid near its

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

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A square coil of side 10 cm consists of 20 turns and carries a current of 12 A. The coil is suspended vertically and the normal to the plane of the coil makes an angle of 30º with the direction of a uniform horizontal magnetic field of magnitude 0.80 T. What is the magnitude of torque experienced by the

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

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Two moving coil meters, M1 and M2 have the following particulars: R1 = 10 Ω, N1 = 30, A1 = 3.6 × 10–3 m2 , B1 = 0.25 T R2 = 14 Ω, N2 = 42, A2 = 1.8 × 10–3 m2 , B2 = 0.50 T (The spring constants are identical for the two meters). Determine the ratio of(i) current sensitivity (ii) voltage sensitivity of M2 and M1

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

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In a chamber, a uniform magnetic field of 6.5 G (1 G = 10 –4 T) is maintained. An electron is shot into the field with a speed of 4.8 × 106 m s–1 normal to the field. Explain why the path of the electron is a circle. Determine the radius of the circular orbit. (e = 1.5 × 10–19 C, `m_e` = 9.1×10–31

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

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In Exercise 4.11 obtain the frequency of revolution of the electron in its circular orbit. Does the answer depend on the speed of the electron?

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

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