JEE Main 2020 (Online) 8th January Evening Slot | Magnetics Question 163 | Physics

JEE Main 2020 (Online) 8th January Evening Slot

MCQ (Single Correct Answer)

-1

A plane electromagnetic wave of frequency 25 GHz is propagating in vacuum along the z-direction. At a particular point in space and time, the magnetic field is given by $$\overrightarrow B = 5 \times {10^{ - 8}}\widehat jT$$. The corresponding electric field $$\overrightarrow E $$ is (speed of light c = 3 × 10⁸ ms^–1)

15 $$\widehat i$$V / m

-15 $$\widehat i$$V / m

1.66 × 10^–16 $$\widehat i$$V / m

-1.66 × 10^–16 $$\widehat i$$V / m

JEE Main 2020 (Online) 8th January Evening Slot

MCQ (Single Correct Answer)

-1

A very long wire ABDMNDC is shown in figure carrying current I. AB and BC parts are straight, long and at right angle. At D wire forms a circular turn DMND of radius R. AB, BC parts are tangential to circular turn at N and D. Magnetic field at the centre of circle is : JEE Main 2020 (Online) 8th January Evening Slot Physics - Magnetics Question 163 English

JEE Main 2020 (Online) 8th January Evening Slot Physics - Magnetics Question 163 English

$${{{\mu _0}I} \over {2\pi R}}\left( {\pi + 1} \right)$$

$${{{\mu _0}I} \over {2\pi R}}\left( {\pi - {1 \over {\sqrt 2 }}} \right)$$

$${{{\mu _0}I} \over {2R}}$$

$${{{\mu _0}I} \over {2\pi R}}\left( {\pi + {1 \over {\sqrt 2 }}} \right)$$

JEE Main 2020 (Online) 8th January Morning Slot

MCQ (Single Correct Answer)

-1

Photon with kinetic energy of 1MeV moves from south to north. It gets an acceleration of 10¹² m/s² by an applied magnetic field (west to east). The value of magnetic field : (Rest mass of proton is 1.6 × 10^–27 kg) :

0.71mT

7.1mT

0.071mT

71mT

JEE Main 2020 (Online) 8th January Morning Slot

MCQ (Single Correct Answer)

-1

At time t = 0 magnetic field of 1000 Gauss is passing perpendicularly through the area defined by the closed loop shown in the figure. If the magnetic field reduces linearly to 500 Gauss, in the next 5s, then induced EMF in the loop is : JEE Main 2020 (Online) 8th January Morning Slot Physics - Magnetics Question 165 English