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University Physics Young and Freedman Chapter 30 Concept Questions and solutions
Chapter 30: Prechapter Question
Q: If there were a steady direct current in the recharging cable, but still no direct contact
between the cable and car's wires, would the cable recharge the electric vehicle's
batteries?
A: No.
For one circuit to induce a current in an adjacent circuit, the 2
nd
circuit must
experience
a timevarying magnetic flux.
But if the current in the 1
st
circuit is steady, it
produces a steady
magnetic field and a steady, unvarying flux in the 2
nd
current.
In this case
no current would be
induced in the 2
nd
circuit.
1.
Consider the Tesla coil described in Example 30.1.
If you make the solenoid out of twice
as much wire, so that it has twice as many turns and is twice as long, how much larger is
the mutual inductance?
Using this doublesized solenoid, how many turns would the
outer coil need for the mutual inductance to be 1.0 H instead of 25 uH?
No effect because M depends on the ratio of the quantities, which remains unchanged.
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This note was uploaded on 04/18/2008 for the course PHYS 0030 taught by Professor Cutts during the Spring '07 term at Brown.
 Spring '07
 Cutts
 Physics, Current

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