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(a) Remains the same
(b) It is doubled
(c) It decreases by a factor of 2
(d) It decreases by a factor of 4
(a) The equivalent capacitance is greater than any of the individual capacitances.
(b) The largest voltage appears across the smallest capacitance.
(c) The largest voltage appears across the largest capacitanvce
(d) The capacitor with the largest capacitance has the greatest charge .
(a) It becomes four times larger
(b) It becomes two times larger
(c) It is unchanged
(d) It becomes one-half as large.
n electron in a uniform electric and magnetic field has a velocity of 1.20 104 m/s (in the positive x direction) and an acceleration of 2.00 1012 m/s2 (in the positive z direction). If the electric field has a magnitude of 20.0 N/C (in the positive z direction), what can you determine about the magnetic field in the region? What can you not determine
An electron is accelerated through 2 400 V from rest and then enters a uniform 1.70-T magnetic field. What are (a) the maximum and (b) the minimum values of the magnetic force this particle can experience?
The needle of a magnetic compass has magnetic moment 9.70 mA
m2. At its location, the Earth’s magnetic field is 55.0 mT north at 48.0° below the horizontal. (a) Identify the orientations of the compass needle that represent minimum potential energy and maximum potential energy of the needle–field system. (b) How much work must be done on the needle to move it from the former to the latter orientation?
A wire is formed into a circle having a diameter of 10.0 cm and placed in a uniform magnetic field of 3.00 mT. The wire carries a current of 5.00 A. Find (a) the maximum torque on the wire and (b) the range of potential energies of the wire–field system for different orientations of the circle.
Imagine a wire with linear mass density 2.40 g/m encircling the Earth at its magnetic equator, where the field is modeled as having the uniform value 28.0 mT horizontally north. What magnitude and direction of the current in the wire will keep the wire levitated immediately above the ground?
A wire carries a steady current of 2.40 A. A straight section of the wire is 0.750 m long and lies along the x-axis within a uniform magnetic field, If the current is in the x-direction, what is the magnetic force on the section of wire?
A wire having a mass per unit length of 0.500 g/cm carries a 2.00-A current horizontally to the south. What are the direction and magnitude of the minimum magnetic field needed to lift this wire vertically upward?
