NEET Physics Question - Current Electricity

Assertion (A): If an observer is moving with drift speed of electrons in direction opposite to current, observer will not experience any magnetic field.

Reason (R): In the frame of observer charged particles in conductor are at rest.

(1) Both (A) & (R) are true and the (R) is the correct explanation of the (A)

(2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(3) (A) is true but (R) is false

(4) Both (A) and (R) are false

Solution:

If an observer moves with the electron drift speed (in the direction of electron flow), electrons are at rest relative to them. However, the positive lattice ions, which were stationary in the conductor's frame, are now moving. This motion of positive ions constitutes a current and produces a magnetic field.

Thus, (A) is false. Also, in this frame, only electrons are at rest, while positive ions are moving, so (R) is false.

Rankers Physics

Magnetic Field in Moving Observer’s Frame

Solution:

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