JEE Main 2020 (Online) 8th January Morning Slot | Magnetics Question 165 | Physics

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

JEE Main 2020 (Online) 8th January Morning Slot Physics - Magnetics Question 165 English

48 μV

28 μV

56 μV

36 μV

JEE Main 2020 (Online) 7th January Evening Slot

MCQ (Single Correct Answer)

-1

A particle of mass m and charge q has an initial velocity $$\overrightarrow v = {v_0}\widehat j$$ . If an electric field $$\overrightarrow E = {E_0}\widehat i$$ and magnetic field $$\overrightarrow B = {B_0}\widehat i$$ act on the particle, its speed will double after a time:

$${{3m{v_0}} \over {q{E_0}}}$$

$${{\sqrt 2 m{v_0}} \over {q{E_0}}}$$

$${{\sqrt 3 m{v_0}} \over {q{E_0}}}$$

$${{2m{v_0}} \over {q{E_0}}}$$

JEE Main 2020 (Online) 7th January Evening Slot

MCQ (Single Correct Answer)

-1

JEE Main 2020 (Online) 7th January Evening Slot Physics - Magnetics Question 169 English

The figure gives experimentally measured B vs H variation in a ferromagnetic material. The retentivity, coercivity and saturation, respectively, of the material are :

1.0 T, 50A/m and 1.5 T

1.5 T, 50 A/m and 1.0 T

150 A/m, 1.0 T and 1.5 T

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