AP EAMCET · PHYSICS · Magnetic Effects of Current
A thin rod of length is magnetized and has magnetic moment . The rod is then bent in a semicircular arc. The magnetic moment in the new shape is
- A
- B
- C
- D
Answer & Solution
Correct Answer
(D)
Step-by-step Solution
Detailed explanation
Length of arc L=πR ⇒R=Lπ ...1 Magnetic moment of rod M=mL ...2 Magnetic moment of semicircular arc Marc=m2R ⇒Marc=m2Lπ ⇒Marc=2πmL ⇒Marc=2πM
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