JEE Main 2021 (Online) 18th March Morning Shift | Magnetic Effect of Current Question 106 | 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 107 English

JEE Main 2021 (Online) 17th March Evening Shift Physics - Magnetic Effect of Current Question 107 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

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