Test 3: Complete Chapter 18 Review

Question 1

When the resistance of the loop is changed and the loop is moved at the same speed each time, the product I x R:

• Aincreases
• Bdecreases
• Calways remains constant
• Dbecomes zero

Question 2

The constant value of I x R in the moving loop experiment is the:

• Ainduced e.m.f.
• Bmagnetic flux
• Cfrequency
• Dpower

Question 3

A coil with 25 turns has an induced e.m.f. of 2.5 V for 0.20 s. The total change in magnetic flux is:

• A0.02 Wb
• B0.2 Wb
• C0.5 Wb
• D12.5 Wb

Question 4

Lenz's law is a direct consequence of the law of conservation of:

• Acharge
• Benergy
• Cmomentum
• Dmass

Question 5

If the induced current reinforced the change instead of opposing it, it would lead to:

• Aa decrease in energy
• Ba perpetual increase in energy, which is impossible
• Cno change in energy
• Da loss of magnetic field