Motional EMF

Practice Questions:

Question 1: easy

A copper rod AB of length L, pivoted at one end A, rotates at constant angular velocity ω, at right angles to a uniform magnetic field of induction B. The e.m.f developed between the mid point C of the rod and end B is :

1. \[\frac{B\omega l^{2}}{4}\]

2. \[\frac{B\omega l^{2}}{2}\]

3. \[\frac{3B\omega l^{2}}{4}\]

4. \[\frac{3B\omega l^{2}}{8}\]

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Question 2: easy

A conducting rod is moved with a constant velocity v in a magnetic field. A potential difference appears across the two ends

1. \[if \overrightarrow{v} \parallel \overrightarrow{l}\]

2. \[if \overrightarrow{v} \parallel \overrightarrow{B}\]

3. \[if \overrightarrow{l} \parallel \overrightarrow{B}\]

4. none of these

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