A cardboard tube is wrapped with two windings of insulated wire, as shown in the

Question

A cardboard tube is wrapped with two windings of insulated wire, as shown in the figure.

a) Is the induced current in the resistor R directed from left to right or from right to left if the current in winding A is directed from a to b and is increasing?

b) Is the induced current in the resistor R directed from left to right or from right to left if the current in winding A is directed from b to a and is decreasing?

c) Is the induced current in the resistor R directed from left to right or from right to left if the current in winding A is directed from b to a and is increasing?

d) Is the induced current in the resistor R directed from left to right or from right to left if the current in winding A is directed from b to a and is constant?

Explanation / Answer

a. Is the induced current in the resistor R directed from left to right or from right to left if the current in winding A is directed from a to b and is increasing?

The induced current in the resistor is directed from right to left.

b) Is the induced current in the resistor R directed from left to right or from right to left if the current in winding A is directed from b to a and is decreasing?

The induced current in the resistor is directed from right to left.

c) Is the induced current in the resistor R directed from left to right or from right to left if the current in winding A is directed from b to a and is increasing?

The induced current in the resistor is directed from left to right.

d) Is the induced current in the resistor R directed from left to right or from right to left if the current in winding A is directed from b to a and is constant?

There is no induced current in the resistor .

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