A thin metallic disc is rotating with constant angular velocity about a vertical axis that is perpendicular to its plane and passes through its centre. The rotation causes the free electrons in the disc to redistribute. Assume that, there is no external electric or magnetic field. Then,

a point on the rim of the disc is at a lower potential than its centre

a point on the rim of the disc is at a higher potential than its centre

a point on the rim of the disc is at the same potential as its centre

the potential in the material has an extremum between centre and the rim

E M B I B E

Physics Crash Course JEE Advanced>Chapter 2 - Kinematics>Exercise 1>Q 14

MEDIUM

Physics

IMPORTANT

Earn 100

Which of the following statements are correct?

5.8% studentsanswered this correctly

Important Questions on Kinematics

HARD

Physics

IMPORTANT

Physics Crash Course JEE Advanced>Chapter 2 - Kinematics>Exercise 1>Q 15

A projectile is projected at an angle

α (> 45 °)

with an initial velocity

u

. The time

t

at which its horizontal component will equal the vertical component in magnitude:

HARD

Physics

IMPORTANT

Physics Crash Course JEE Advanced>Chapter 2 - Kinematics>Exercise 1>Q 16

A projectile of mass

1 kg

is projected with a velocity of

\sqrt{20} m s^{- 1}

such that it strikes on the same level as the point of projection at a distance of

\sqrt{3} m

. Which of the following options is correct?

HARD

Physics

IMPORTANT

Physics Crash Course JEE Advanced>Chapter 2 - Kinematics>Exercise 1>Q 17

A car of mass

M

is moving on a horizontal circular path of radius

R

. At an instant its speed is

v

and is increasing at a constant rate

β .

MEDIUM

Physics

IMPORTANT

Physics Crash Course JEE Advanced>Chapter 2 - Kinematics>Exercise 1>Q 18

Assuming the motion of Earth around the Sun as a circular orbit with a constant speed of

30 km h^{- 1}

.

HARD

Physics

IMPORTANT

Physics Crash Course JEE Advanced>Chapter 2 - Kinematics>Exercise 1>Q 19

Two boats,

A

and

B

, having same speed relative to the river, are moving in a river. Boat

A

moves normal to the river current, as observed by an observer, moving with the velocity of the river current. Boat

B

moves normal to the river, as observed by an observer on the ground.

HARD

Physics

IMPORTANT

Physics Crash Course JEE Advanced>Chapter 2 - Kinematics>Exercise 1>Q 20

A man standing on the edge of the terrace of a high-rise building throws a stone vertically up with a speed of

20 m s^{- 1}

. Two seconds later an identical stone is thrown vertically downwards with the same speed of

20 m s^{- 1}

. Then

HARD

Physics

IMPORTANT

Physics Crash Course JEE Advanced>Chapter 2 - Kinematics>Exercise 1>Q 21

If

\vec{P} \times \vec{Q} = \vec{Q} \times \vec{P},

the angle between

\vec{P}

and

\vec{Q}

is

θ (0 ° < θ < 360 °) .

The value of

θ

will be ________

°

.

HARD

Physics

IMPORTANT

Physics Crash Course JEE Advanced>Chapter 2 - Kinematics>Exercise 1>Q 22

Two trains, which are moving along different tracks in opposite directions towards each other, are put on the same track due to a mistake. Their drivers, on noticing the mistake, start slowing down the trains when the trains are $300 m$ apart. Graphs given below show their velocities as a function of time as the trains slow down. What is the separation between the trains (in metre) when both have stopped?

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