IB myp 4-5 physics – Practice Questions- All Topics
Topic :Electromagnetism-Electric and Magnetic Fields
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:
Describe the reading on the ammeter when the switch is opened again.
▶️Answer/Explanation
Ans: There is a change in magnetic field so a current is induced. This causes the ammeter to jump to the left.
Question:
Give one other way in which the ammeter reading could be increased.
▶️Answer/Explanation
Ans: For example, increase the voltage of the cell.