Anonymous
Anonymous asked in Science & MathematicsPhysics · 6 months ago

A square loop of wire with side length 2 cm is in the plane of the page. At time t=0, a 9T magnetic field is into the page. . .?

A square loop of wire with side length 2 cm is in the plane of the page. At time t=0, a 9T magnetic field is into the page. The field changes to 4T directed into the page in 0.25s.

A) What is the magnetic flux through the loop of wire at time t=0?

B) What is the magnetic flux through the loop of wire 0.25s later?

C) What is the emf induced in the loop of wire during this time?

D) If the resistance of the loop is 0.02 ohms, what is the induced current in the wire?

E) Does the induced current in the wire flow clockwise or counterclockwise?

Please show/explain all work.

Will award best answer.

Thank you!

1 Answer

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  • Anonymous
    6 months ago
    Favorite Answer

    A) Φ = Bo L^2 (magnetic flux = magnetic field * area, where * = scalar product)

    B) Φ = B L^2 (as above)

    C) emf = - (B - Bo) / (t - to) = (Bo - B) / (t - to) (Faraday/Lenz law)

    D) I = emf / R (Ohm law)

    E) counterclockwise (induced current must generate a magnetic flux variation opposed to original flux variation)

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