Electromagnetism Quiz Review Mr. Davis Baltimore Poly

1) Electricity can be generated by rotating a wire loop between the poles of a magnet. In which of the following positions would induce the greatest current in the loop?  A. The plane of the loop is parallel to the magnetic field.  B. The plane of the loop is perpendicular to the magnetic field.  C. The plane of the loop makes an angle of 45° with the magnetic field.  D. The induced current is the same in all positions.

2) In a transformer, the secondary loop has twice as many turns as the primary. If the alternating current in the primary loop is 2 A, what is the current in the secondary loop?  A. 1 A  B. 2 A  C. 4 A  D. It cannot be determined.

3) The voltage across the input terminals of a transformer is 110 V. The primary has 50 loops and the secondary has 120 loops. The output voltage of the transformer is  A. 46 V.  B. 55 V.  C. 180 V.  D. 264 V

4) A steady current, I, flows though a straight wire. A circular loop of wire is placed next to the wire. Which of the following will not produce an induced current in the loop?  A. Move the loop away from the wire.  B. Move the loop toward the wire.  C. Increase the electric current in the wire.  D. Decrease the electric current in the wire.  E. Move the loop in parallel to the wire.

5) A bar magnet with the north pole faced downward is held above a horizontal circular coil. Which of the following statements about the induced current is true (viewed from above)?  A. The induced current flows in a clockwise direction.  B. The induced current flows in a counter-clockwise direction.  C. The induced current flows first in a clockwise and then in a counter-clockwise direction.  D. The induced current flows first in a counter-clockwise and then in a clockwise direction.  E. There is no induced current in the coil.

6) A rectangular loop of wire with dimensions 0.2 m x 0.5 m is placed in a uniform magnetic field of magnitude 2 T. The magnetic field is perpendicular to the plane of the loop. What is the magnetic flux in the loop?  A. 0.1 Tm 2  B. 0.2 Tm 2  C. 0.3 Tm 2  D. 0.4 Tm 2  E. 0.5 Tm 2

7) The magnetic flux through a wire loop in a magnetic field B does NOT depend on: A) The magnetic of the field B) The area of the loop C) The shape of the loop D) The angle between the loop and the direction of B

8) The emf produced in a wire by its motion across a magnetic field depends on the orientation of the wire.  A) True  B) False

9) The path of a charged particle moving parallel to a uniform magnetic field will be: A) Straight line B) Circle C) Ellipse D) Parabola

10) In a transformer, the primary coil has twice as many loops as the secondary coil. This is a _____ transformer. A) Step-down B) Reduction C) Induction D) Step-up E) Voltage

11) In a mass spectrometer, an ion will have a smaller radius for its circular path if: A) Its speed is greater B) Its charge is greater C) The magnetic field is weaker D) Its mass is greater