Please explain the following problems. Thank you! The inner loop carries a curre

Question

Please explain the following problems. Thank you!

The inner loop carries a current I that is increasing the resistor r is in the outer loop The induced current through tic resistor R is: zero from a to b from b to a A magnet is dropped through a loop of wire as shown in figure. Describe how the value of the magnetic field changes(at the loop) at the magnet approaches the loop a long vertical wire carries a steady 9 A current. A pair of rails are horizontal and are 0.1 m apart. A 7.ohm resist or connects points a and b, at the end of the rails. A bar is in contact with the rails, and is moved by an external force with a constant velocity of 0.6 m/s as shown. The bar and the rails have neg ligible resistance. At a given instant the bar is 0.29 m from the wire, as shown. In Figure, at time what is the induced current

Explanation / Answer

A) zero

B)the magnetic field due to current carrying loop i upward (inside the loop) by right hand rule

the magnetic field due to the magnet is in opposite direction and as the magnet approaches the loop its value increases so the total value decreases

C) induced emf = B*l*V where l = 0.1m and V=0.6m/s

where B = (2*10^-7*i)/r where i = 9 and r=0.29m

now substituing these values you will get Induced emf

now induced current= emf/R = induced emf/7.6

calculate to find the answer

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