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Lesson: Motion Induced Emf

Worksheet: Motion Induced Emf • 5 Questions

Q1:

An automobile with a radio antenna 1.0 m long travels at 100.0 km/h in a location where the Earth’s horizontal magnetic field is T. What is the maximum possible emf induced in the antenna due to this motion?

Q2:

A coil with 50 turns and area 10 cm2 is oriented with its plane perpendicular to a 0.75-T magnetic field. If the coil is flipped over (rotated through ) in 0.20 s, what is the average emf induced in it?

Q3:

The rod shown in the diagram moves to the right on negligible-resistance rails at a speed of . If everywhere in the region of the rails, what is the current through the 5.0 resistor?

Q4:

The conducting rod shown in the accompanying figure moves along parallel metal rails that are 25-cm apart. The system is in a uniform magnetic field of strength 0.75 T, which is directed into the page. The resistances of the rod and the rails are negligible, but the section has a resistance of 0.25 Ω.

What is the magnitude of the emf induced in the rod when it is moving to the right with a speed of 5.0 m/s?

What force is required to keep the rod moving with a speed of 5.0 m/s?

What is the rate at which work is done by the force required to keep the rod moving with a speed of 5.0 m/s?

What is the power dissipated in the resistor?

Q5:

A 500-turn coil has an 0.250-m2 area. The coil is spun in Earth’s magnetic field and a 12.0-kV maximum emf is induced in the coil. Find the angular speed at which the coil must be spun to induce this emf. Use a value of T for the Earth’s magnetic field magnitude.

  • A rad/s
  • B rad/s
  • C rad/s
  • D rad/s
  • E rad/s
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