The resistance of the rectangular current loop is R, and the metal rod is slidin

Question

The resistance of the rectangular current loop

is R, and the metal rod is sliding to the left.

The length of the rod is d, while the width

of the magnetic region is ?. a and b are the

contact points where the rod touches the rails,

and d > ? . Consider the relationship between

the potentials Vb and Va and the direction of

the induced magnetic ?eld.

Which statement is true? (I'm pretty sure I have to use eiter Lenz's law or the right hand rule or both but I'm not sure how could someone please explain?)

1. Va > Vb and B^ is up

2. Vb > Va and B^ is down

3. Va > Vb and B^ is down

4. Vb = Va and B^ is up

5. Vb = Va and B^ is out of the page.

6. Va > Vb and B^ is out of the page.

7. Vb = Va and B^ is into the page.

8. Vb > Va and B^ is out of the page.

9. Vb > Va and B^ is into the page.

10. Va > Vb and B^ is into the page.

The resistance of the rectangular current loop is R, and the metal rod is sliding to the left. The length of the rod is d, while the width of the magnetic region is ?. a and b are the contact points where the rod touches the rails, and d > ? . Consider the relationship between the potentials Vb and Va and the direction of the induced magnetic ?eld. Which statement is true? (I'm pretty sure I have to use eiter Lenz's law or the right hand rule or both but I'm not sure how could someone please explain?) 1. Va > Vb and B^ is up 2. Vb > Va and B^ is down 3. Va > Vb and B^ is down 4. Vb = Va and B^ is up 5. Vb = Va and B^ is out of the page. 6. Va > Vb and B^ is out of the page. 7. Vb = Va and B^ is into the page. 8. Vb > Va and B^ is out of the page. 9. Vb > Va and B^ is into the page. 10. Va > Vb and B^ is into the page.

Explanation / Answer

9

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