A single current-carrying circular loop of radius R is placed next to a long, st

Question

A single current-carrying circular loop of radius R is placed next to a long, straight wire, as shown in the sketch in Figure 22-6. The current in the wire points to the right and is of magnitude I. In which direction must current flow in the loop to produce zero magnetic field at its center? A) clockwise B) counterclockwise C) It is indifferent if clockwise or counterclockwise. D) The current in the loop should be zero A. Consider again the previous problem (Figure 22-6). In this problem the loop is again a conductor and initially carries no current. If the current in the wire is decreasing with time at a consant rate, then what is the induced current direction in the conducting loop? A) there will be no induced current B) clockwise C) counterclockwise

Explanation / Answer

18 Answer) From right handedness principle the inducued magentic filed due to straight wire will be out of the page, so to nullify the magnetic field induced by it the current in the loop must be in clockwise direction.

Option A is correct.

19) The magnetic field induced by the current in the in the wire will induces current in the loop. This induced current will be in counter clockwise direction.

Option C is correct

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