1) The force between two parallel wires carrying currents in the same direction

Question

1) The force between two parallel wires carrying currents in the same direction is:

a. repulsive

b. zero

c. attractive

2) The magnetic force between the two infinitely long current-carrying parallel wires placed at distance d from each other is proportional to:

a. 1/d

b. 1/d^2

c. 1/d

d. d^2

e. 1/2d

3) Which of the following occurs when an RLC circuit is at its resonant frequency?

a. impendance of the circuit is maximized

b. Power disipated on the load resistor is minimized

c. Voltage in circuit is maximized

d. The current in circuit is maximized

4) The graph of power consumed in a RLC circuit versus angular frequency is shown below for three different values of the resistor. What is the correct relationship of the quality factor Q?

Image link: http://imgur.com/DlMsXYb

a. Q1<Q2<Q3

b. Q1=Q3<Q2

c. Q1<Q3=Q2

d. Q3<Q1<Q2

e. Q2<Q1<Q3

f. Q1<Q3<Q2

g. Q2<Q3<Q1

h. Q2=Q1=Q3

5) An RLC circuit appears to not follow Kirchhoff’s loop rule when measured with a DMM because:

a. Kirchoff’s Law is more of a guideline than a law.

b. DMM does not account for phase and only measures the RMS value of AC voltage.

c. RLC circuits do not follow Kirchoff’s Law.

Explanation / Answer

1)

correct option is (c)

the force between two parallel wires carryng current in same direction is in opposite direction,

and attractive each other

2)

correct option is (c)

because, B=uo*i/(2pi*d)

3)

correct option is (d)

at resonance, impedance is minimum, Z=R

then , current is minimum

4)

correct option is (a)

from the graph,

the quality factor measure the sharpness of the graph,

===>

Q1<Q2<Q3

5)

correct option is (b)

because,

DMM does not account for phase and only measures the RMS value of AC voltage

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