The torque acting on a current carrying coil is given by _.
Correct answer: A. τ = NIAB cos α
- A. τ = NIAB cos α
- B. τ = BIL sin α
- C. τ = NIAB sin α
- D. τ = BIL cos α
Explanation
The correct formula for the torque acting on a current-carrying coil is τ = NIAB cos α. This equation accounts for the number of loops (N), the current (I), the area vector (A), the magnetic field (B), and the cosine of the angle (α) between the magnetic field and the area vector. Option A correctly incorporates all these elements. Option B is incorrect because it misses the number of loops and uses 'sin α', which is relevant for a straight wire in a magnetic field. Option C is wrong because it uses 'sin α' instead of 'cos α', which does not correctly describe the orientation of the coil in the magnetic field. Option D also omits the number of loops, which is essential for calculating torque in a coil.
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Magnetic Flux Density
Magnetic flux density measures the magnetic force acting on a current carrying conductor or moving charge in a magnetic field. Work includes the relations B equals F divided by IL and F equals qvB, the tesla as its SI unit, field direction and the distinction between flux density and magnetic flux.
Practise Electromagnetism
1,176 free Electromagnetism MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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.
More Magnetic Flux Density questions
Which one of the following relations is correct?
The value of permeability of free space μo is:
Ampere's law is ∫B.dl =
The sensitivity of a galvanometer can be decreased by:
Force on a current carrying conductor in a uniform magnetic field is:
'F' is the maximum force acting on a conductor. Now if we change the direction of the conductor by making an angle of 45° with the magnetic field, then the force becomes: