While a loudspeaker converts electrical signals into sound, a microphone uses a similar interaction between magnetic fields and current to convert __________ into electrical signals.

sound waves

light waves

gravitational potential

thermal energy

Question

Why does placing a 'soft' iron core inside a solenoid significantly increase the strength of the resulting electromagnet?

When observing the magnetic field lines around a straight current-carrying wire, how does the spacing between the concentric circles change as the distance from the wire increases?

When using the right-hand grip rule for a straight wire, the direction of the __________ is represented by the direction in which the right thumb is pointing.

According to the textbook, adding an iron core to a solenoid can increase the magnetic field strength by approximately how much compared to an air-cored solenoid?

MYP MYP Physics Topic Electric and Magnetic Fields Questionbank

Practice MYP MYP Physics Topic Electric and Magnetic Fields with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for Electric and Magnetic Fields and mirrors Paper 1, 2 style where relevant.

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The iron core increases the electrical resistance of the circuit

The iron core produces its own current to add to the wire's current

The iron core acts as a heat sink to keep the wire cool

The magnetic domains in the iron align with the solenoid's field

The spacing decreases

The spacing increases

The circles merge into a single line

The spacing remains constant

Magnetic field lines

Electron flow

Conventional current

Magnetic North pole

100 times

2 times

1000 times

10 times