Multiple choice

The vertical component of the earth's magnetic field in a place is 3 x 10-5 T. What is the potential difference between the ends of the axle of a car, which are 1.5 m apart, when car's velocity is 20 m/s?

  1. 0.1 x 10-5 V

  2. 9.0 x 10-4 V

  3. 0.025 x 105 V

  4. 40 x 10-5 V

  5. 0.23 x 10-5 V
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The potential difference between the ends of the axle of a car is given by ε = Bvvl = 3.0 x 10- 5 x 20 x 1.5 = 9.0 x 10- 4 V.

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