A circular loop of wire is lying flat on a horizontal table, and you are looking

Question

A circular loop of wire is lying flat on a horizontal table, and you are looking down at it. An external magnetic field has a constant direction that is perpendicular to the table, and there is an induced current in the loop that circulates clockwise. Is the external magnetic field directed upward toward you or downward away from you, and is its magnitude increasing or decreasing? A) Upward magnetic field that is increasing. B) Downward magnetic field that is increasing. C) Upward magnetic field that is decreasing. D) Downward magnetic field that is decreasing. When the switch in the drawing is closed, the current in the coil increases to its equilibrium value. While the current is increasing there is an induced current in the metal ring. The ring is free to move. What happens to the ring? A) The ring jumps downward. B) The ring does not move. C) The ring jumps upward. A transformer changes the 120-V emf at a wall socket up to 12,000 Volts. What happens to the current and power? A) The current and power both increase by a factor of 100. B) The current increases by a factor of 100, but the power remains constant. C) The current remains constant, but the power increases by a factor of 100. D) The current remains constant, but the power decreases by a factor of 100. E) The current decreases by a factor of 100, but the power remains constant. F) The current and power both decrease by a factor of 100.

Explanation / Answer

3)correct option is (B)

4) correct option is (A)

5) Vp = 120 V , Vs = 12000 V

Vp/Vs = Np/Ns = Is/Ip

120/12000 = Is/Ip

Is/Ip = 1/100

Pp = Ps

correct option is (E)

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