Chapter 4: Q5E (page 912)
An electron experiences a magnetic force of magnitudewhen moving at an angle of 60.0° with respect toa magnetic field of magnitude. Find the speed ofthe electron.
Short Answer
The velocity is
Chapter 4: Q5E (page 912)
An electron experiences a magnetic force of magnitudewhen moving at an angle of 60.0° with respect toa magnetic field of magnitude. Find the speed ofthe electron.
The velocity is
All the tools & learning materials you need for study success - in one app.
Get started for freeA heart defibrillator is used to enable the heart to start beating if it has stopped. This is done by passing a large current ofthrough the body atfor a very short time, usuallyabout . (a) What power does the defibrillator deliver to the body, and (b) how much energy is transferred ?
The battery for a certain cell phone is rated at.According to the manufacturer it can produceof electrical energy, enough for of operation, before needing to be recharged. Find the average current that this cell phone draws when turned on.
The capacity of a storage battery, such as those used in automobile electrical systems, is rated in ampere-hours .A battery can supply a current offor or for and so on. (a) What total energy can be supplied by a battery if its internal resistance is negligible? (b) What volume (in litres) of gasoline has a total heat of combustion equal to the energy obtained in part (a)? (See Section 17.6; the density of gasoline is .) (c) If a generator with an average electrical power output ofrole="math" localid="1655719210000" is connected to the battery, how much time will be required for it to charge the battery fully?
High-voltage power supplies are sometimes designed intentionally to have rather large internal resistance as a safety precaution. Why is such a power supply with a large internal resistance safer than a supply with the same voltage but lower internal resistance?
BIO The average bulk resistivity of the human body (apart from surface resistance of the skin) is about . The conducting path between the hands can be represented approximately as a cylinder 1.6 m long and 0.10 m in diameter. The skin resistance can be made negligible bysoaking the hands in salt water. (a) What is the resistance between the hands if the skin resistance is negligible? (b) What potential difference between thehands is needed for a lethal shock current of 100 mA ? (Note that your result shows that small potential differences produce dangerous currents when the skin is damp.) (c) With the current in part (b),what power is dissipated in the body?
What do you think about this solution?
We value your feedback to improve our textbook solutions.