JEE Main 2021 (Online) 17th March Evening Shift | Magnetic Effect of Current Question 129 | Physics

A hairpin like shape as shown in figure is made by bending a long current carrying wire. What is the magnitude of a magnetic field at point P which lies on the centre of the semicircle?

JEE Main 2021 (Online) 17th March Evening Shift Physics - Magnetic Effect of Current Question 129 English

JEE Main 2021 (Online) 17th March Evening Shift Physics - Magnetic Effect of Current Question 129 English

$${{{\mu _0}I} \over {4\pi r}}(2 - \pi )$$

$${{{\mu _0}I} \over {2\pi r}}(2 - \pi )$$

$${{{\mu _0}I} \over {4\pi r}}(2 + \pi )$$

$${{{\mu _0}I} \over {2\pi r}}(2 + \pi )$$

JEE Main 2021 (Online) 17th March Morning Shift

MCQ (Single Correct Answer)

-1

A solenoid of 1000 turns per metre has a core with relative permeability 500. Insulated windings of the solenoid carry an electric current of 5A. The magnetic flux density produced by the solenoid is : (permeability of free space = 4$$\pi$$ $$\times$$ 10^$$-$$7 H/m)

$$\pi$$T

2 $$\times$$ 10^$$-$$3$$\pi$$ T

10^$$-$$4$$\pi$$ T

$${\pi \over 5}$$ T

JEE Main 2021 (Online) 16th March Evening Shift

MCQ (Single Correct Answer)

-1

A charge Q is moving $$\overrightarrow {dl} $$ distance in the magnetic field $$\overrightarrow {B} $$. Find the value of work done by $$\overrightarrow {B} $$.

Zero

$$-$$1

Infinite

JEE Main 2021 (Online) 25th February Morning Shift

MCQ (Single Correct Answer)

-1

A proton, a deuteron and an $$\alpha$$ particle are moving with same momentum in a uniform magnetic field. The ratio of magnetic forces acting on them is _________ and their speed is _______, in the ratio.

2 : 1 : 1 and 4 : 2 : 1

4 : 2 : 1 and 2 : 1 : 1

1 : 2 : 4 and 2 : 1 : 1

1 : 2 : 4 and 1 : 1 : 2

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