Please answer all of them. even without explantion. If the magnetic field at P f

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Please answer all of them. even without explantion.

If the magnetic field at P from a current-carrying long straight wire has magnitude B_0 at a distance r_o what is the magnetic field at a distance r/2? A. 2B_0, into the page B. 2B_0, out of the page C. B_0/2, into the page D. B_0/2, out of the page E. B_0/4, out of the page A loop of conducting wire in the plane of the page, with a radius of 0.50 m and of R = 0.5 Ohm, is placed in a magnetic field that is increasing at a rate of 0.5 T/s. which statement is true? A. The net flux through the loop is 0, and there is no current flow. B. There is a current flow of pi/8 Amps in the clockwise direction. C. There is a current flow of pi/8 Amps in the counterclockwise direction. D. There is a current flow of pi/4 Amps in the clockwise direction. E. There is a current flow of pi/4 Amps in the counterclockwise direction A pure capacitor connected across an A.C. voltage consumed average power of 50 W. This is due to A. the capacitive reactance in ohms B. the current flowing in capacitor C. the capacitive reactance and the current in the capacitor D. the size of the capacitor being quite big E. the statement is incorrect A long straight wire is carrying a current of 2.4 A in a region where the magnetic field is 0.52 mT, what is the magnetic force on 3.0 m of the wire? A. 3.7 times 10^-3 N, West B. 3.7 times 10^-3 N, East C. 7.2 times 10^-3 N, East D. 3.7 N, West E. 7.2 N, East In an series RLC ac circuit the current in the inductor and the current in the resistor are: A. out of phase by 90 degree with the current in the inductor leading. B. out of phase by 90 degree with the current in the resistor leading. C. in phase with each other. D. out of phase by an amount proportional frequency. E. out of phase by an amount inversely proportional to frequency

Explanation / Answer

5. option B

6. Induced e.m.f e= Area*dB/dt = pi*1/4*1/2

Induced current =e.m.f/R = Pi*1/4

from lenz's law clock wise direction

option D

7. C

8.A (F=BIL)

9.A

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