(a)
The induced emf.
Answer to Problem 17P
Solution:
Induced emf is
Explanation of Solution
Given info:
Magnetic field(B)=
Length (l)=
=
Speed v =
Resistance(R)=
=
Formula to be used:
By Faraday’s law, an induced emf E whose magnitude is given by,
[Because velocity is perpendicular to the magnetic Field]
Calculation:
Applying values,
(b)
The current in the U-shaped conductor.
Answer to Problem 17P
Solution:
Current in the conductor
Explanation of Solution
Given info:
Emf,
Formula to be used:
By ohm’s law, the induced current is given by,
Calculation:
Applying values,
(c)
The external force.
Answer to Problem 17P
Solution:
External force is
Explanation of Solution
Given info:
Current,
Magnetic field (B)=
Length (l)=
=
To keep the rod’s velocity constant, there should be an equal external force to the right because the current is in the upward magnetic field and the magnetic force to the left.
Formula to be used:
Hence to calculate the external force F (for a constant )
Calculation:
Applying values,
Chapter 21 Solutions
Physics: Principles with Applications
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