1. The magnetic flux through a loop can change due to a change in which of the f
ID: 2007657 • Letter: 1
Question
1. The magnetic flux through a loop can change due to a change in which of the following (there may be more than one correct answer)?
Check all that apply.
__the direction of the field relative to a fixed loop
__the orientation of the loop with respect to a fixed field direction
__the strength of the magnetic field
__the area of the coil
2. Which of the following electromagnetic waves travels slowest in a vacuum?
a. radiowaves
b. gamma rays
c. green light
d. infrared light
e. they all have the same speed
3. A bar magnet is thrust toward the center of a circular metallic loop. The magnet approaches perpendicularly with its length perpendicular to the coil's plane. As the bar recedes from your view and approaches the coil, a clockwise current is induced in the loop. What polarity is that end of the bar magnet nearest the coil?
a. south
b. north
c. you can't tell from the data given
4. A metallic plate is in the plane of your paper. A uniform magnetic field is perpendicular to the plane of the paper and creates a magnetic flux in the plate. Give the direction of the eddy currents in the plate (clockwise, counterclockwise, or zero) for each of the following cases.
Assume you are looking down onto the paper's plane.
a. The field points away from you and is decreasing.
a. clockwise
b. counterclockwise
c. zero
b. The field points toward you and is increasing.
a. clockwise
b. counterclockwise
c. zero
c. The field points toward you and is decreasing.
a.counterclockwise
b.clockwise
c. zero
d. The field points away from you and does not change with time.
a. counterclockwise
b. clockwise
c. zero
Explanation / Answer
(1) Since, Magnetic flux through loop is given by the formula : B = B A If orientation of the loop with respect to a fixed field direction ,The area of the loop will goes to change If strength of the magnetic fieldis changes also cauaes the change of magnetic flux Ans : (1) : B & C (2) Since , electromagnetic wave travels with speed equal to light velocity Ans: E (All having same speed) (3) Acc. to Lenz's law Direction of the current in the loop is clockwise when the NORTH end of the magnet moves towards it : Ans: B is correct Ans: B is correct (4) Note: Given options : most confused which one i should take , i don't know:
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.