1. In figure 1 , a horizontal conducting bar of mass m , slides along two fixed
ID: 2094044 • Letter: 1
Question
1. In figure 1, a horizontal conducting bar of mass m, slides along two fixed horizontal, parallel conducting rails as a constant force is exerted. The set up is subjected to a magnetic field directed into the page. A current I flows as shown. At an arbitrary time t, how many external forces act on the conducting bar (neglect friction)? (Explain your answer!)
a) one
b) two
c) three
d) four
2. In figure 2, a vertical rectangular loop of wire is at the end of a rigid bar on its way down as it passes through a region R where a magnetic field (pointing into the plane) is present. At that instant decide whether the magnetic field will tend to
a) one
b) two
c) three
d) four
Explanation / Answer
1)just two (const force, force due to B because of current ((B x i)l).
2)Push away from region
From Faraday law of induction An object always tries not to change flux through it , So When Gravity pull the loop inward increasing flux through it which field force tries to decrease by pushing it away from field.
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