TestUstad

A solenoid 15cm long has 300 turns of wire. A current of 5A flows through it. What is the magnitude of the magnetic field inside the solenoid?

Correct answer: C. 4πx10-3T

  • A. 75 x 10^7T
  • B. 60 x 10^4T
  • C. 4πx10-3T
  • D. 750π x103T

Explanation

The magnetic field inside a solenoid can be calculated using the formula:B = µ0 x n x Iwhereµ0 = permittivity of free space = 4πx10-7I = Current = 5An = is the number of turns per unit length (turns per meter) = 300/0.15 = 2000Substitute these values in the formulaB = 4πx10-7 x 5 x 2000.B = 4πx10-7 x 1x104B = 4πx10-3.

Written and checked by , contributorLast updated
Report an error

The more specific you are, the faster it gets fixed. A source beats an opinion.

Prefer email? [email protected]

About Electromagnetism

Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.

Practise Electromagnetism

1,176 free Electromagnetism MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.

Start a free Electromagnetism testAll Electromagnetism MCQs

Discussion

Stuck on an option, or know a faster way to get there? Ask or explain it here.

No comments yet. Be the first to explain this one.

Exams that ask Physics questions like this

Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.

Lecturer Physics Test Physics80 MCQsSubject Specialist Physics Test Physics80 MCQsNET Physics60 MCQsNUMS Physics40 MCQsDUHS Physics36 MCQsETEA MDCAT Physics36 MCQsKMU Physics36 MCQsMDCAT Physics36 MCQsECAT Physics30 MCQsETEA Engineering Admission Test Physics30 MCQsGIKI Physics30 MCQsNED Physics30 MCQsPIEAS Physics30 MCQsPMD Physics25 MCQsBSN Entry Test Physics20 MCQsPAF Airman Physics15 MCQs

More Electromagnetism questions

When a current-carrying conductor is placed in a magnetic field. It moves from a region of:

A straight conductor carries a current I and is split into a circular loop of radius r as shown in Fig. The magnetic field at the center O of the circle is

A conductor of length 1m, carrying a current of 1A is placed at an angle of 45o to the magnetic field of 1 gauss. The force acting on the conductor is

A wire of length 2m carries a current of 10A. What is the force acting on it when it is placed at an angle of 45o to the uniform magnetic field of 0.15T?

A unit of magnetic induction is:

A one metre long wire is lying at right angles to the megnetic field. A force of 1N is acting on it in a magnetic field of 0.98 testa. The current flowing in it will be