6, A col is wrapped with 300 turns of wire on the perimeter of a square frame (s

Question

6, A col is wrapped with 300 turns of wire on the perimeter of a square frame (side length = 20 cm). Each turn has the same area as the frame, and the total resistance of the coil is 1.5 O. A uniform magnetic field perpendicular to the plane of the coil changes in at a constant rate from 0.50 T to 0.90 T in 2.0 s. What is the magnitude of the emf in the coil while the field is changing? a. 2.4 V b 1.6 v c. 3.2 V d. 4.0 V e. 8.4V Bonus (# 7) 7. A straight wire is bent into the shape shown. Determine the net magnetic force on the wire when the current l ravels in the direction shown in the magnetic field B (Z axis is out of the page) 90 b. 2/BL in the +z direction c. 4IBL in the +z direction d. 4IBL in the-z direction e. zero

Explanation / Answer

Induce emf

E= NA dB/dT

= 300* (0.2*0.2)* (0.9-0.5)/2

= 2.4 V

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Force, F= Bi(2L)

= 2BiL

Using Fleming left hand rule,

Force is directed along +z axis

Opion (b) is correct.

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Comment in case any doubt..goodluck

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