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

Question

9. 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. 10. A material which has no resistance (usually at a very cold temperature) is known as alda) A) ideal l insulator B) semiconductor )perfect resistorD) superconductor 11. Whose law expressed by the formula, /At), 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 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 leaving the junction."- is associated with which individual? 12. Relative to the page what is the direction of the force on a positive charged particle moving down the page 13. The statement that.. ."The sum of the currents entering a junction is equal to the sum of the currents A)Ampere B)Coulomb C)Einstein D) Faraday E)Kirchhoff F) Ohm 14. What is Michael Faraday noted for? A) He unified the fields of electricity and magnetism into the single field of electromagnetism. B) Rewriting Ampere's Law to include a displacement current C) He wrote the rule for determining the direction of an induced emf in a conducting loop in a changing magnetic flux. D) His formula for calculating the strength of an induced emf. E) He discovered that a current through a wire will cause the needle of a nearby compass to deflect | ?. ?@ ?@ ?° ?#8#8o @p ?@ ? @n@e@n@n @p@geo, ?

Explanation / Answer

9-

Current is opposite to the direction of motion of electrons.

so the current is upward.

using right hand thumb rule,

the magnetic field is into the page at point A.

10-

At very cold temperature the electrical resistance drop to zero for superconductor.(D) is correct .

11-

According to Faraday's law for a closed loop emf is given

E = -Nd(phi)/dt

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