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Name: Class: Date: SMK (L) Methodist Kuala Lumpur STPM Physics Semester 2 Worksheet 17.0 Electromagnetic Induction 17.2 Faraday’s law and Lenz’s law 17.2.1 Faraday’s law and Lenz’s law 17.2.2 Generator (Dynamo) 17.2.3 Induced e.m.f. in Linear Conductors 1. An aeroplane with a wing span of 36 m flies horizontally in the northerly direction with a speed of 220 m s -1 . The vertical component of the Earth’s magnetic field is 3.8×10 -5 T. a) Calculate the e.m.f. induced between the wing tips. Which wing tip is at the positive potential? b) The wing tips are connected by wires to a sensitive voltmeter. What is the reading of the voltmeter? Explain your answer. 2. A square coil of copper wires of sides 0.075 m has 25 turns and is placed in a uniform magnetic field of flux density 0.85 T. The coil is then rotated at a constant speed of 2.0 revolutions per second about the axis of rotation. a) State the angle that the coil makes with the magnetic field when the induced e.m.f. is maximum. What is the maximum value of the induced e.m.f.? b) Sketch a graph to show the variation of the induced e.m.f. with the angle turned through for a complete rotation of the coil. 3. A 9.2 cm diameter loop of wire is initially oriented perpendicular to a 1.5 T magnetic field. It is rotated so that its plane is parallel to the field direction in 0.20 seconds. What is the average induced e.m.f. in the loop? 4. The rectangular loop shown in Fig. 21-44 is pushed into the magnetic field which points inward as shown. In what direction is the induced current flowing through the resistor R? 5. The north pole of the magnet in Fig. 21-45 is being inserted into the coil. In which direction is the induced current flowing through the resistor R? (Hints: From right to left or left to right through the resistor ) 1/1
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Physics STPM
Transcript of 17.2
Name:
Class:
Date:
SMK (L) Methodist Kuala Lumpur
STPM Physics Semester 2
Worksheet
17.0Electromagnetic Induction17.2Faradays law and Lenzs law17.2.1Faradays law and Lenzs law
17.2.2Generator (Dynamo)
17.2.3Induced e.m.f. in Linear Conductors
1.An aeroplane with a wing span of 36 m flies horizontally in the northerly direction with a speed of 220 m s-1. The vertical component of the Earths magnetic field is 3.810-5 T.a) Calculate the e.m.f. induced between the wing tips. Which wing tip is at the positive potential?
b) The wing tips are connected by wires to a sensitive voltmeter. What is the reading of the voltmeter? Explain your answer.
2.A square coil of copper wires of sides 0.075 m has 25 turns and is placed in a uniform magnetic field of flux density 0.85 T. The coil is then rotated at a constant speed of 2.0 revolutions per second about the axis of rotation.
a) State the angle that the coil makes with the magnetic field when the induced e.m.f. is maximum. What is the maximum value of the induced e.m.f.?
b) Sketch a graph to show the variation of the induced e.m.f. with the angle turned through for a complete rotation of the coil.
3.A 9.2 cm diameter loop of wire is initially oriented perpendicular to a 1.5 T magnetic field. It is rotated so that its plane is parallel to the field direction in 0.20 seconds. What is the average induced e.m.f. in the loop?4.The rectangular loop shown in Fig. 21-44 is pushed into the magnetic field which points inward as shown. In what direction is the induced current flowing through the resistor R?
5.The north pole of the magnet in Fig. 21-45 is being inserted into the coil. In which direction is the induced current flowing through the resistor R? (Hints: From right to left or left to right through the resistor)
6.The magnetic flux through a coil of wire containing two loops changes from -30 Wb to +38 Wb in 0.42 secs. What is the e.m.f. induced in the coil?7.A circular loop in the plane of the paper lies in a 0.75 T magnetic field pointing into the paper. If the loop's diameter changes from 20.0 cm to 6.0 cm in 0.50 s, (a) what is the direction of the induced current, (b) what is the magnitude of the average induced emf, and (c) if the coil resistance is 2.5 , what is the average induced current?1/1
