A square loop with a resistor is in a magnetic field which varies in strength. D
ID: 1262208 • Letter: A
Question
A square loop with a resistor is in a magnetic field which varies in strength. Determine and explain the direction of the induced current (if there is one) in each case. Assume that the loop isnever moved outsidethe field.
a: The loop is moved straight to the right.
b: The loop is moved straight up.
d: The loop is moved straight down.
e: The loop is moved straight out of the paper.
f: The loop is moved straight into the paper.
A square loop with a resistor is in a magnetic field which varies in strength. Determine and explain the direction of the induced current (if there is one) in each case. Assume that the loop isnever moved outsidethe field. a: The loop is moved straight to the right. b: The loop is moved straight up. d: The loop is moved straight down. e: The loop is moved straight out of the paper. f: The loop is moved straight into the paper.Explanation / Answer
The non-uniform magnetic field as shown in the diagram seems to increase as we move upward.
The following answers were obtained using Fleming's right hand rule.
a) Moving right does not cause in change in flux as side way motion moves the loop into an indentical magnetic field area. Thus no current is induced.
b) Moving straight up, causes a change in flux. The change in flux is more severe towards the top of the loop as compared to the lower part of the loop. Thus effective current is clockwise.
d) Moving down, causes a change in flux. The change in flux is more severe towards the top of the loop as compared to the lower part of the loop. Thus effective current is anti-clockwise
e)Moving straight out of the paper does not cause in change in flux as this motion moves the loop into an indentical magnetic field area. Thus no current is induced.
f)Moving straight into the paper does not cause in change in flux as this motion moves the loop into an indentical magnetic field area. Thus no current is induced.
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