A current carrying coil is placed in a uniform magnetic field.The torque produced in this coil will be doubled when the
Correct answer: D. Area of coil is doubled.
- A. Force in the magnetic field is doubled.
- B. Length of coil is reduced to half.
- C. Moment arm is reduced to half.
- D. Area of coil is doubled.
Explanation
The torque (τ) on a current-carrying coil in a magnetic field is given by τ = n · I · A · B · sin(θ), where n is the number of turns, I is the current, A is the area, B is the magnetic field strength, and θ is the angle between the normal to the coil and the magnetic field. Doubling the area (A) will directly double the torque, making Option D correct.Option A is incorrect as doubling the force without changing other parameters does not necessarily double the torque. Option B is incorrect because reducing the length would decrease the area, thus reducing the torque. Option C is incorrect because reducing the moment arm decreases the torque.
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
A current carrying conductor experiences maximum magnetic force in a uniform magnetic field when the conductor is placed
When an electric current passes through a straight wire, it is surrounded by a/ an
If 9 A current is passing through a wire of length 1.5 m experiences a perpendicular magnetic force of 0.25 N, then the magnetic field is
A metallic wire of length 1 m is placed perpendicular to a uniform magnetic field of 10 T.If this wire is carrying current of 100 A, then the force acting on this wire will be
An electrical galvanometer becomes more sensitive when
If a 1 m metallic wire is placed perpendicularly in a uniform magnetic field of 0.10 T and carrying current of 10 A, then the force acting on the wire will be