Lenz's law is a rule regrading

Question

BlackTom AI · Accepted Answer

Question restatement: 'Lenz's law is a rule regrading' with the following answer choices:
- the magnitude of the current produced by a changing electric field.
- the direciton of the current flow produced by a changing electric field.
- the magnitude of the current produced by a changing magnetic field.
- the direction of the current flow produced by a changing magnetic field.

Option 1: 'the magnitude of the current produced by a changing electric field.' This is incorrect because Lenz's law is not about how large the induced current is or about electric field changes causing a current magnitude; it focuses on the direction of the induced current due to magnetic effects. Misconception: magnitude reasoning ignores magnetic flux changes and energy conservation aspects that govern orientation, leading to an incomplete statement.

Option 2: 'the direciton of the current flow produced by a changing electric field.' There are two issues here: a) a misspelling ('direciton' but also b) the underlying physics is about changing magnetic flux, not directly about a changing electric field driving current. The term 'electric field change' does not by itself set the induced current direction; the surrounding magnetic environment is the key factor. This option misstates the causal agent.

Option 3: 'the magnitude of the current produced by a changing magnetic field.' This option incorrectly emphasizes magnitude rather than direction. Lenz's law specifies the direction that the induced current will oppose the change in magnetic flux; it does not assert a predefined magnitude relationship.

Option 4: 'the direction of the current flow produced by a changing magnetic field.' This is the accurate statement. Lenz's law is about the induced current direction that will oppose the change in magnetic flux through a circuit, which is why the magnetic field change (not electric field change) governs the orientation of the current. The sign of the induced current is determined by the need to create a magnetic field that opposes the flux change.

In summary, options 1 through 3 each misstate either what quantity is affected (magnitude vs. direction) or what changing field drives the effect (electric vs. magnetic). The correct option is 4, which correctly identifies that Lenz's law concerns the direction of the induced current produced by a changing magnetic field.

APPHYSC142-031 with labs Exam Review - Final

Lenz's law is a rule regrading

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