HSSC-II (12th Class) Physics Unit-13: Electromagnetism: Numerical Problems List (New Book/KPK Text Board, Peshawar) With Verified Answers

1: At what distance from a long straight wire carrying a current of 10 A is the magnetic field is equal to the earth's magnetic field of 5 ｘ 10⁻⁵ T? (Answer: 0.04 m) 

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2: A long solenoid having 1000 turns uniformly distributed over a length of 0.5 m produces a magnetic field of 2.5 ｘ10⁻³ T at the center. Find the current in the solenoid. (Answer: 1 A)

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3: A proton moving at right angles to a magnetic field of 0.1 T experiences a force of 2 ｘ 10⁻¹² N. What is the speed of the proton? (Answer: 1.3 ｘ 10⁻⁸ m/s) 

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4: An 8 MeV proton enters perpendicularly into a uniform magnetic field of 2.5 T. (a) Find the force on the electron (b) What will be the radius of the path of proton? (Answer: 1.6 ｘ 10⁻¹¹ N, 0.17 m) 

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5: 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? (Answer: 3.6 ns)

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6: A rectangular coil with 250 turns is 6.0 cm long and 4.0 cm wide. When the coil is placed in a magnetic field of 0.25 T, its maximum torque is 0.20 Nm. What is the current in the coil? (Answer: 1.5A) 

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7: Crossed electric and magnetic fields are established over a certain region. The magnetic field is 0.105 T and the electric field is 2.00 ｘ 10⁵ V/m. An electron, experiences zero net force from these fields and so continues moving in a straight line. What is the electron's speed? (Answer: 1.9x 10⁶m/s) 
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8: The full scale deflection for a galvanometer is 10 mA. Its resistance is 100 Ω. How can it be converted into an ammeter of range 100 A? (Answer: Rₛ = 0.010) 

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9:  How a 5 mA, 100 Ω galvanometer is converted into 20 V voltmeter? (Answer: `\R_H` = 1900 N) 

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10: Two parallel wire 10 cm apart carry currents in opposite directions of 8 A. What is the magnetic field halfway between them? (Answer: 6.4 ｘ 10⁻⁵ T)

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