1.) A solenoid is created by winding coated copper wire around a nail to create
ID: 1420095 • Letter: 1
Question
1.) A solenoid is created by winding coated copper wire around a nail to create N loops on the nail. Voltage is applied to the wire so it carries a constant current I through its coils. The magnetic field is measured to be B at the center of the coil. Suppose the voltage is doubled while the number of loops N remains the same. What is the new magnetic field, and why?
a. B, because magnetic field strength is independent of current when an iron nail is involved.
b. 4 B, because doubling the voltage quadruples the current, and the field goes up by a factor of four.
c. 2 B, because magnetic field is directly proportional to current.
d. B / 2 , because magnetic field is inversely proportional to current.
2.) A solenoid is created by winding coated copper wire around a nail to create N loops on the nail over a length L. Voltage is applied to the wire so it carries a constant current through its coils. The magnetic field is measured to be B. What effect will increasing the number of coils N wrapped around the nail have on the magnetic field B?
It will increase the magnetic field, but only if you also get a longer nail so that the number of coils per unit length, N / L, remains the same.
It will increase the magnetic field, but only if you increase the winding density. This can be done by winding coils more densely over the same length L.
It will decrease the magnetic field, which is inversely proportional to N.
There will be no effect because magnetic field does not depend on the number of coils in any way.
a.It will increase the magnetic field, but only if you also get a longer nail so that the number of coils per unit length, N / L, remains the same.
b.It will increase the magnetic field, but only if you increase the winding density. This can be done by winding coils more densely over the same length L.
c.It will decrease the magnetic field, which is inversely proportional to N.
d.There will be no effect because magnetic field does not depend on the number of coils in any way.
Explanation / Answer
(1) Magnetic field will be get double because emf and magnetic field is proportional, therefore
C will be option.
(2) For this it will be b .
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