I: This pentagonal loop of wire is in a uniform magnetic field; at t = 0 s, the
ID: 1493688 • Letter: I
Question
I: This pentagonal loop of wire is in a uniform magnetic field; at t = 0 s, the field begins increasing at a rate of 40 T/s:
II: This rectangular loop of wire is in a uniform magnetic field; at t = 0 s, the field begins decreasing at a rate of 43 T/s:
III: The figure shows a side view of a loop of wire with a bar magnet near but below the loop. The bar magnet's south pole is aimed up (towards the loop). Att = 0 s, the magnet is moved; it is either raised or moved left.
(a) Direction of the Current through the loopbefore t = 0 s ---Select--- clockwise, counterclockwise, there is no current at this time (b) Direction of the Original Magnetic Field(the field not created by any current in the loop) ---Select--- into the page, out of the page, clockwise, counterclockwise (c) Change in magnetic flux for loop after t = 0 s ---Select--- increasing, decreasing, the flux is constant at this time (d) Direction of the Induced Magnetic Field aftert = 0 s
(at the loop's center) ---Select--- into the page, out of the page, clockwise, counterclockwise, there is no induced magnetic field at this time (e) Direction of the Induced Current through the loop after t = 0 s ---Select--- into the page, out of the page, clockwise, counterclockwise, there is no induced current at this time
Explanation / Answer
a) before t =0 , field was not changing.
and induced current = rate of change of flux / R = 0
b) Into the page (As shown)
c) flux = B.A
and B is increasing hence flux also increasing
d) induced field will be in direction to resist the increasing flux.
field is increasing into direction , so induced field will be out of page.
Ans: Out of page
e) current -> counterclockwise direction,
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a) before t =0 , field was not changing.
and induced current = rate of change of flux / R = 0
b) Out of Page (As shown)
c) flux = B.A
and B is decreasing hence flux also decreasing
d) induced field will be in direction to resist the decreasing flux.
field is decreasing in the out of page direction , so induced field will be out of page.
Ans: Out of page
e) current -> counterclockwise direction,