# In a uniform magnetic field, there is a coil with an area S = 50 cm2. The perpendicular to the plane of the loop

January 15, 2021 | education

| **In a uniform magnetic field, there is a coil with an area S = 50 cm2. The perpendicular to the plane of the loop makes an angle α = 60 ° with the direction of the magnetic field. The induction of the magnetic field is B = 0.2 T. What is the average value of the electromotive force of induction arising in a loop when the field is turned off during delta t = 0.02 s?**

Let’s write the formula for solving the problem:

Ф = B * S * cos α;

Let’s write down the formula for finding the electromotive force:

EMF = – delta (F) / delta (t);

Let’s substitute in the first formula and solve:

Ф = 0.2 * 0.005 * 0.5;

Ф = 0.0005 Wb;

Let’s substitute in the second formula and solve:

EMF = 0.0005 / 0.02

EMF = 0.025 V;

Answer: EMF = 0.025 V.

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