A wire runs along the left edge of this page. If the free electrons in the wire

Question

A wire runs along the left edge of this page. If the free electrons in the wire are going down the edge of the page, what is the direction of the magnetic field with respect to the middle of the page (point A)? A) The field will go through point A from the left to the right across the page. B) The field will be directed into the page at point A. C) The field will go through point A from the bottom to top of the page. D) The field will be directed out of the page at point A. E) The field will be directed diagonally through point A from the upper left to lower right of the page. A bar of silver (black bar at the left of the drawing) is moving from left to right across the page. If there is a magnetic field directed into the page, which side of the bar has a net negative charge? A) front B) back C) top D) bottom E) right F) left Whose law expressed by the formula, euro = -N(Delta Phi/Delta t), is used to determine the magnitude of the emf induced in a coil through which there is a changing magnetic flux? A) Ampere B) Coulomb C) Faraday D) Lenz E) Maxwell Relative to the page what is the direction of the force on a positive charged particle moving down the page through a uniform magnetic field which is directed left to right across the page? A) right B) left C) up D) down E) into the page F) out of the page The magnetic flux through an area is given by tau = IAB sin theta, where theta is the angle between which quantities? A) The plane the loop lies in and the B field. B) The normal to the plane the loop lies in and the B field. C) None of these.

Explanation / Answer

1)

from right hand rule the magneitc field is perpendicular to line joining

the point and wire

OPTION (D)

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top

option(c)

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Lenz law

OPTION( C)

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velocity v = -vz k (into)

magnetic field B = Bx i (right)

charge q = -e

magnetic force F = q*(vxB)

F = -e*(-vz k x Bx i )

F = e*vz*Bx (-j)   down

OPTION (D)

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OPTION (C)

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