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Problem 1 At what distance from a long wire carrying a current of 10 A is the magnetic field equal to the earth’s magnetic field.
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Problem 2 A long solenoid having 100 turns uniformly distributed over a length of 0.5 m produces a magnetic field of 2.5 x 10^-3 T at the center. Find the current in the solenoid?
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Problem 3 A proton moving at right angle in a magnetic field of 0.1 T experiences a force of 2*10^-12 N. What is the speed of proton?
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Problem 4 A 8 Mev proton enters perpendicularly in a uniform magnetic field. Find (a) force on proton (b) what will be the radius of the path of proton?
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Problem 5 A wire carrying current 10 mA experiences a force of 2 N in a uniform magnetic field. What is the force on it when the current is 30 mA.
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Problem 6 What is the time period of an electron projected into a uniform magnetic field of 10 mT and moves in a circle of radius 6 cm?
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Problem 7 A 0.2 m wire is bent into circular shape and is placed in a uniform magnetic field of 2 T. If the current in the wire is 20 mA, then find the maximum torque acting on the loop?
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Problem 8 The full scale deflection of a galvanometer is 10 mA. Its resistance is 100 ohms. How can it be converted to an ammeter of range 100 A
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Problem 9 How a 5 mA, 100 ohms galvanometer is converted into a 20 V voltmeter?
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Problem 10 Two parallel wires 10 cm apart carry currents in opposite directions of 8 A. What is the magnetic field half way between them?
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Problem A wire carrying 2 A current and has length of 10 cm between the poles of a magnet is kept at an angle of 30 deg to the uniform magnetic field of 0.6 T. Find the force acting on the wire.
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Problem Two long parallel wires 6 cm apart carry current of 8 A and 2 A. What is the magnitude of magnetic field midway between them?
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Problem A solenoid is 10 cm long and is wound whit two layers of wire. The inner layer has 50 turns and the outer layer has 40 turns. A current of 3 A flows in both layers in the same direction. What is magnitude of magnetic flux density along the axis of solenoid?
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Problem The path of an electron in a uniform magnetic field of flux density 1 x 10^2 T in a vacuum is a circle of radius 1 cm. Calculate the period of its orbit.
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Problem A rectangular coil of 100 turns and area 200 cm^2 carrying 2 A current is placed in a uniform magnetic field of 2 T. Calculate the maximum torque on the coil.
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