25. At tho instant the negatively charged ody is at the ceiin is motion is in th

Question

25. At tho instant the negatively charged ody is at the ceiin is motion is in the segative x dieection The charged body ast ts nan the getic in the negative y direction. B) in the negative z direction C) in the positive y direction in the positive z direction in the positive?direction. A) D) E) 26. A 25-cm long conducting rod moves al a speed of 12 m's in a plaave perpendicalar to a uniform magnetic field of magnitude 0.180 T. What is the induced potentiai difTerence between the ends of the rod? A) 2.4 V B) 6.0 v C) 0.54 v D) 0.24 v E) 0.60 kv 27. When the positive current in a long wire is flowing in a direction from N to S, it cres a magnetic field below the wire that is directed A) from W to E. b) from S to N. C) from E to W D) E) from NE to SW. from N to S. 28. How much does the maximum EMF produced by a generator (a rotating circul change if the radius of the coil is doubled and the angular frequency halved? A) it is decreased by a factor of four B) it is impossible to tell given the information provided C) it is the same D) it is increased by a factor of two E) it is increased by a factor of eight

Explanation / Answer

25) Option B)

in the negative z-direction.

26) Option C)

L = 25 cm = 0.25 m

v = 12 m/s

B = 0.18 T

Now E = vB = 12*0.18 = 2.16 V/m

Then V = E*L = 2.16*0.25 = 0.54 V

27) Option A)

From west to East

28) Option C)

Peak EMF is proportional to peak value of d(flux)/dt

d (flux)/dt is proportional to coil area and angular frequency

2x area and freq/2 =======> same max EMF

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