Advertisements
Advertisements
Question
A thin semi-circular conducting ring (PQR) of radius r is falling with its plane vertical in a horizontal magnetic field B, as shown in the figure.
The potential difference developed across the ring when its speed v , is
Options
Zero
`("Bv"pi"r"^2)/2` and P is at higher potential
πrBv and R is at higher potential
2rBv and R is at higher potential
Advertisements
Solution
2rBv and R is at higher potential
APPEARS IN
RELATED QUESTIONS
What is electromagnetic induction?
Name a common device that uses electromagnets.
Explain why, an electromagnet is called a temporary magnet.
How is the working of an electric bell affected, if alternating current be used instead of direct current?
Welders wear special goggles or face masks with glass windows to protect their eyes from electromagnetic radiations. Name the radiations and write the range of their frequency.
Show diagrammatically how an alternating emf is generated by a loop of wire rotating in a magnetic field. Write the expression for the instantaneous value of the emf induced in the rotating loop.
Electromagnetic induction means ______.
Why soft iron is preferred to be used as the core of the electromagnet of an electric bell?
State Fleming’s right-hand rule.
Give an illustration of determining direction of induced current by using Lenz’s law.
