As a magnet is moved within a coil, the rate of change of the magnet field is proportional to the coil's induced (output) voltage. This describes which law?单项选择题

A

Faraday's

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Using Stokes' Theorem, which of the following is Faraday's Law induction in differential form? 1) ∇ ∙ 𝐵 → = ∂ 𝐸 → ∂ 𝑡 2) ∇ × 𝐵 → = − ∂ 𝐸 → ∂ 𝑡 3) ∇ ∙ 𝐸 → = ∂ 𝐵 → ∂ 𝑡 4) ∇ × 𝐸 → = − ∂ 𝐵 → ∂ 𝑡  

Using Stokes' Theorem, which of the following is Faraday's Law induction in differential form? 1) ∇ ∙ 𝐵 → = ∂ 𝐸 → ∂ 𝑡 2) ∇ × 𝐵 → = − ∂ 𝐸 → ∂ 𝑡 3) ∇ ∙ 𝐸 → = ∂ 𝐵 → ∂ 𝑡 4) ∇ × 𝐸 → = − ∂ 𝐵 → ∂ 𝑡  

A circular coil with an area of 0.0500 m2 is wrapped with 500 turns of wire and is placed in a uniform magnetic field perpendicular to its plane. If the field changes in value from -0.100 T to +0.150 T in an interval of 0.500 s, what is the magnitude of the average voltage induced in the coil?

A 243-turn circular coil of radius 30 cm is placed in a spatially uniform magnetic field with its axis parallel to the magnetic field lines. The magnetic field is changing temporally at a rate of -0.04 T/s i.e., dB/dt = -0.04 T/s. The resistance of the coil is 6.3 Ω. What is the magnitude of the current circulating through the coil? Neglect the effect of Earth’s magnetic field. Calculate your answer in the units of ampere (A). Write your answer in decimal form with two digits to the right of the decimal point (e.g. 5.32); do not write any units.

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