IB myp 4-5 physics – Practice Questions- All Topics
Topic :Electromagnetism-Electromagnetic forces and induction
Topic :Electromagnetism– Weightage : 21 %
All Questions for Topic : Electric Fields,Static Electricity ,Magnetism,Magnetic Fields,Current,Power,Voltage,Electric Circuits,Electric and Magnetic Fields,Electromagnetic forces and induction
Question:
Explain why the ammeter registers a current when the switch is first closed, but after a short time, the current reading returns to zero.
▶️Answer/Explanation
Ans: When the switch is closed, the magnetic field changes so a current is induced in coil Y
Question:
The iron rod is replaced with a wooden one. Explain what the difference in the induced current would be.
▶️Answer/Explanation
Ans: This would weaken the magnetic field around coil X. The change in magnetic field would be smaller when the switch is closed, causing the induced current in coil Y to be reduced.
Question:
The number of turns in the wire in coil X is doubled. Explain why the ammeter reading is greater when the switch is closed.
▶️Answer/Explanation
Ans: This would strengthen the magnetic field around coil X. The change in magnetic field would be greater when the switch is closed, causing the induced current in coil Y to increase.