Q.1: The plates of a capacitor are connected to abattery. What happens to the ch
ID: 1733484 • Letter: Q
Question
Q.1: The plates of a capacitor are connected to abattery. What happens to the charge on the plates if the connectingwires are removed from the battery? What happens to the charge ifthe wires are removed from the battery and connected to eachother? Q.2: If a charged particle moves in a straight line throughsome region of space, can you say that the magnetic field in thatregion is zero? Q.3: How can the motion of a moving charged particle be usedto distinguish between a magnetic field and an electric field? Givea specific example to justify your argument. Q.4: What is the net force on a compass needle in a uniformmagnetic field? Q.1: The plates of a capacitor are connected to abattery. What happens to the charge on the plates if the connectingwires are removed from the battery? What happens to the charge ifthe wires are removed from the battery and connected to eachother? Q.2: If a charged particle moves in a straight line throughsome region of space, can you say that the magnetic field in thatregion is zero? Q.3: How can the motion of a moving charged particle be usedto distinguish between a magnetic field and an electric field? Givea specific example to justify your argument. Q.4: What is the net force on a compass needle in a uniformmagnetic field? Q.4: What is the net force on a compass needle in a uniformmagnetic field?Explanation / Answer
Q.1: The plates of a capacitor areconnected to a battery. What happens to the charge on the plates ifthe connecting wires are removed from the battery? What happens tothe charge if the wires are removed from the battery and connectedto each other?The charge acquired remains on the plates. The voltage across theplates V equal to the battery voltage then the charge Q differencebetween the plates is Q = CV where C is capacitance of thecapacitor. When one shortcircuits the capacitor wires the charge difference Q becomes zero as the charge gets evenlydistributed between the capacitor plates.
Q.2: If a charged particle moves in astraight line through some region of space, can you say that themagnetic field in that region is zero?
No. We can only be certain that the magnetic field if exists isparallel to the charge movement.
Q.3: How can the motion of a movingcharged particle be used to distinguish between a magnetic fieldand an electric field? Give a specific example to justify yourargument.
Only the normal component of the magnetic field to the path ofmotion of a charge has any effect on that charge. Force F onthe charged particle in the magnetic field B is
F= qB x v = qB v sin()
- angle between the field and a line of motion
v -speed of charge q.
Notice that if the charge q does not move the field B has noinfluence.
Q.4: What is the net force on a compassneedle in a uniform magnetic field?
Consider magnetic dipole moment click here.
= x B
F= /R where
- torque
B - magnetic field
- magnetic dipole
F - force in question
R - radius or length of the magnetic needle arm.
Q.4: What is the net force on a compassneedle in a uniform magnetic field?
Consider magnetic dipole moment click here.
= x B
F= /R where
- torque
B - magnetic field
- magnetic dipole
F - force in question
R - radius or length of the magnetic needle arm.
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