NEET UG PHYSICS MCQ: MAGNETISM AND MATTER

1 Medium

1 of 1

Application +4 | -1

A current of 1A is flowing on the sides of an equilateral triangle of side

4.5 \times {10^{ - 2}}m

. The magnetic field at the centre of the triangle will be:

View answer and explanation

Correct option: A

4 \times {10^{ - 5}}\,Wb/{m^2}

Option A is correct because the magnetic field at the center of the triangle is calculated using the formula B = (3μ₀I)/(2πd), where d is the perpendicular distance from the side to the center, resulting in 4 × 10⁻⁵ Wb/m².

More Questions from MAGNETISM AND MATTER

Practice All Chapter MCQs →

Assertion: If a unit north pole rotates around a current carrying wire then work has to be done.
Reason: Magnetic field produced by current is always non - conservative in nature. The magnetic length of a bar magnet is 15 cm then its geometric length is If area vector

\vec A = 2\vec i - 3\vec j + 6\vec k\,{m^2}

flux density vector

\vec B = - 3\vec i + \vec j + 2\vec k\,\left( {Wb/{m^2}} \right)

. Then magnetic flux linked with the coil is [Wb] The area of hysteresis loop of a material is equivalent to

250\;joule

. When

10\;kg

material is magnetized by an alternating field of

50\;Hz

then energy lost in one hour will be (density of material is

7.5\;gm/c{m^3}

) A bar magnet of moment

M

is placed in the magnetic field

B

. The torque acting on the magnet is Assertion(A): Earth's magnetic field inside a closed iron box is less as compared to the out side.

Reason(R): The magnetic permeability of iron is low.