JEE Main 2020 (Online) 6th September Morning Slot | Magnetics Question 131 | Physics

JEE Main 2020 (Online) 6th September Morning Slot

MCQ (Single Correct Answer)

-1

An electron is moving along +x direction with a velocity of 6 $$ \times $$ 10⁶ ms^–1. It enters a region of uniform electric field of 300 V/cm pointing along +y direction. The magnitude and direction of the magnetic field set up in this region such that the electron keeps moving along the x direction will be :

3 $$ \times $$ 10^–4 T, along –z direction

5 $$ \times $$ 10^–3 T, along –z direction

5 $$ \times $$ 10^–3 T, along +z direction

3 $$ \times $$ 10^–4 T, along +z direction

JEE Main 2020 (Online) 6th September Morning Slot

MCQ (Single Correct Answer)

-1

A particle of charge q and mass m is moving with a velocity $$ - v\widehat i$$ (v $$ \ne $$ 0) towards a large screen placed in the Y - Z plane at a distance d. If there is a magnetic field $$\overrightarrow B = {B_0}\widehat k$$ , the maximum value of v for which the particle will not hit the screen is :

$${{2qd{B_0}} \over m}$$

$${{qd{B_0}} \over {3m}}$$

$${{qd{B_0}} \over {2m}}$$

$${{qd{B_0}} \over {m}}$$

JEE Main 2020 (Online) 5th September Evening Slot

MCQ (Single Correct Answer)

-1

The quantities x = $${1 \over {\sqrt {{\mu _0}{\varepsilon _0}} }}$$, y = $${E \over B}$$ and z = $${l \over {CR}}$$ are
defined where C-capacitance, R-Resistance, l-length, E-Electric field, B-magnetic field and $${{\varepsilon _0}}$$, $${{\mu _0}}$$, - free space permittivity and permeability respectively. Then :

Only y and z have the same dimension

x, y and z have the same dimension

Only x and y have the same dimension

Only x and z have the same dimension

JEE Main 2020 (Online) 5th September Evening Slot

MCQ (Single Correct Answer)

-1

An iron rod of volume 10^–3 m³ and relative permeability 1000 is placed as core in a solenoid with 10 turns/cm. If a current of 0.5 A is passed through the solenoid, then the magnetic moment of the rod will be :

5 $$ \times $$ 10² Am²

0.5 $$ \times $$ 10² Am²

500 $$ \times $$ 10² Am²

50 $$ \times $$ 10² Am²

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