Question

Indicate whether the following statements are true (T) or false (F), and explain your reasoning. Please note that if only part of a statement is true, another part is false, you should mark the whole statement as false.

a) If a wire carries an alternating current (that is, a current that changes constantly), and a circuit is placed nearby, there will necessarily be an induced current in the circuit.

b) If a wire carries a constantly increasing current and a circuit is placed nearby, a current will be induced in it. If instead he wire carries a constantly decreasing current, however, no current will be induced in the circuit.

c) If two charged particles move through a region with a magnetic field, the one moving slower will be deflected more, since it's easier to change the trajectory of slow particles than of fast ones.

d) Magnets are generally attracted to current-carrying wires because the wires are made of copper, which is a ferromagnetic material.

e) If the magnetic field through a loop of wire is constant, and the area of the loop isn't changing either, then there will be no induced current in the loop.

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Thank you!

Answer 1

(a) True

Changing current will change magnetic field near wire which further change magnetic flux. Hence emf (rate of change of flux) will induced in the circuit.

(b) False

Decreasing current will also change magnetic field and which further change magnetic flux. Hence emf (rate of change of flux) will induced in the circuit. Induced emf create current.

(c) False

Force hence more velocity particle have more force and more deflection.

(d) False

Magnet attract current carrying wire due the magnetic nature of current carrying wire. Current also create magnetic field.

(e) True

(no change in flux since no change in area and no change in B)