Iconstant I decreasing I-constant I increasing I-constant I -constant For each p
ID: 2306192 • Letter: I
Question
Iconstant I decreasing I-constant I increasing I-constant I -constant For each part of this question, indicate which one or more loops of wire is correct by entering the corresponding letter or letters. If more than one letter is correct, enter the letters of your answer in alphabetical order with no spaces in between. If none of the loops of wire is correct, enter the word NONE (a) In which of the situations, if any, is the magnetic flux through the loop decreasing? (b) In which of the situations, if any, is the magnetic flux through the loop constant? (c) In which of the situations, if any, will there be a current induced in the loop going clockwise? (d) In which situations, if any, will there be NQ current induced in the loop?Explanation / Answer
(a)
Answers are A and B
Magnetic field due to a current carrying wire decreases as we move away from the wire. So in the first case, the loop is moving away from the wire and hence the induced flux is decreasing. The magnetic field aroud a current carrying wire is directly proportional to the current through it. In the second case, the induced flux is decreasing due to decrease in the current through the wire.
(b)
Answer are C and E
Magnetic field of a current carrying wire decrease as we move away from it, but it is consitant if we move parallel to it.
(c)
Answers are A and D
In the first case, magnetic field is decreasing through the loop in the into the page direction. So the induced magnetic field is to oppose the decrease, ie the induced field should be in the into the page direction. So the direction of current is clockwise.
In the second case, magnetic field is increasing through the loop in the out of the page direction. To oppose the increase, direction of magnetic field should be into the page. Into the page magnetic field is produced by the clockwise current.
(d)
Answers are C and E
If the flux through a loop is constant, the induced current will be zero.
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