Two long, parallel wires carry currents of different magnitudes. If the amount o

Question

Two long, parallel wires carry currents of different magnitudes. If the amount of current in each wire is doubled, what happens to the magnitude of the force between the wires? A) It is tripled. B) It is quadrupled. C) It is reduced by a factor of 2. D) It is doubled. E) It stays the same. A conducting loop in the form of a circle is placed perpendicular to a magnetic field of 0.50 T. If the area of the loop increases at a rate of 3.0 times 10^-3 m^2/s, what is the induced emf in the loop? A) 0 mV B) 1.5 mV C) 1.7 mV D) 5.5 mV E) 4.3 mV

Explanation / Answer

Q5.

magnitude of force per unit length between two wires carrying current I1 and I2 and at a distance d is given by

mu*I1*I2/(2*pi*d)

so if current in each wire is doubled, force will be 2*2=4 times

hence option B is correct.

Q6.

flux =magnetic field * area

emf induced =rate of change of flux

=magnetic field*rate of change of area

=0.5*3*10^(-3) volts

=1.5 mV

hence option B is correct.

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