Solenoid
Trending Questions
Q. In a current carrying long solenoid, the field produced does not depend upon
- Number of turns per unit length
- Current flowing
- Radius of the solenoid
- All of the above three
Q. Magnetic field at point P at a distance d from vertex of infinite wire carrying current i as shown in figure is
![](https://s3-us-west-2.amazonaws.com/infinitestudent-images/ckeditor_assets/pictures/420713/original_Screen_Shot_2019-08-09_at_4.26.17_PM.png)
![](https://s3-us-west-2.amazonaws.com/infinitestudent-images/ckeditor_assets/pictures/420713/original_Screen_Shot_2019-08-09_at_4.26.17_PM.png)
- μ02πid
- μ0 i4π d(1−√3)
- μ04πid(2−√3)
- μ0πid
Q. A solenoid of length 50 cm with 600 turns is connected to a cell and current through the solenoid is 20πA. Find magnetic field inside the solenoid (in central region). Assume solenoid is ideal
- 9.6×10−3 T
- 4.8×10−3 T
- 2.4×10−3 T
- 9.6×10−7 T
Q. A winding wire which is used to frame a solenoid can bear a maximum 10 A current. If length of solenoid is 80cm and it's cross sectional radius is 3 cm then required length of winding wire is (B=0.2T)
- 1.2×102m
- 4.8×102m
- 2.4×103m
- 6×103m
Q. Two coaxial solenoids 1 and 2 of the same length are set so that one is inside the other. The number of turns per unit length are n1 and n2 . The currents i1 and i2 are flowing in opposite directions. The magnetic field inside the inner coil is zero. This is possible when?
[Roorkee 2000]
[Roorkee 2000]
- i1≠i2 and n1=n2
- i1=i2 and n1≠n2
- i1=i2 and n1=n2
- i1n1=i2n2
Q. Field inside a solenoid is
- Directly proportional to its length
- Directly proportional to current
- Inversely proportional to total number of turns
- Inversely proportional to current
Q. The magnetic field inside a long solenoid is increased from 2×10−3 T to 2.5 T when an iron core is inserted in it. Find the relative permeability of the iron core.