A system of capacitors is connected across a voltage source as shown in the figu

Question

A system of capacitors is connected across a voltage source as shown in the figure. What is the equivalent capacitance of this system? 3.3 mu F 1.5 mu F 15 mu F 3.6 mu F None of the other answers is correct. Which of the following statements is exactly correct? The north pole of a magnet points exactly towards Earth's magnetic south pole. The north pole of a magnet points exactly towards Earth's magnetic north pole. The north pole of a magnet points exactly towards Earth's geographic north pole. The north pole of a magnet exactly towards Earth s geographic south pole. None of the above statements is correct. A proton is projected with a velocity of 7.0 times 10^3 m/s into a magnetic field of 0.60 T perpendicular to the motion of the proton. What is the force that acts on the proton? 0 N 3.4 times 10^-14 N 6.7 times 10^-14 N 4.2 times 10^-14 N 13 times 10^-14 N A rectangular coil, with comers labeled ABCD, of length L and width w is placed in a magnetic field B as shown in the figure. If there is a current I flowing through this coil, what is the direction of the force acting on section CD (right side) of this coil? in the opposite direction of the magnetic field in the direction of the magnetic field perpendicular to and into the page perpendicular to and out of the page none

Explanation / Answer

Q10.

in the top branch 2 uF and 4 uF are connected in series.

net capacitance=2*4/(2+4)=4/3 uF

in the lower branch , 3 uF and 6 uF are in series.

net capacitance=3*6/(3+6)=2 uF

these (4/3) uF and 2 uF are conencted in parallel.

hence equivalent capacitance=2+(4/3)=10/3=3.3 uF

hence option A is correct.

Q11.

north pole of a magnet points exactly towards Earth's magnetic south pole.

hence option A is correct.

Q12.as field and velocity are perpendicular to each other.

force magnitude=charge*speed*magnetic field*sin(90)

=1.6*10^(-19)*7*10^3*0.6

=6.72*10^(-16) N

hence option C is correct.

Q13.force direction is cross product of direction of current and direction of magnetic field

here current is along -ve y axis, and magnetic field is along +ve x axis

then force is along +ve z axis.

which is perpendicular and out of the page.

hence option D is correct.

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