Choose the battery as current source and set the number of wire loops to four. W
ID: 2031074 • Letter: C
Question
Choose the battery as current source and set the number of wire loops to four. With a nonzero current going through the solenoid, measure the magnetic field strength at a point. Now decrease the number of wire loops to two. How does the magnetic field strength change at the point you chose?
a. There will be no change in current when number of loops reduces from four to two.
b. The current decreases to half of its initial value when number of loops reduces from four to two.
c. The current increases to twice of its initial value when number of loops reduces from four to two.
d. The current increases to four times of its initial value when number of loops reduces from four to two.
Explanation / Answer
when there are two loops
as the length of wire will be halved
it's resistance will also be half
hence , for the same voltage
the current will double
c. The current increases to twice of its initial value when number of loops reduces from four to two.