Free Printable Electrons

Worksheets

Electrons

Total questions: 22

Worksheet time: 28mins

Name

Class

Date

The specific charge of an electron is

1.78x10¹¹ C/Kg

1.6x10¹⁰ C/Kg

9.1x10^-31 C/Kg

1.6x10^-19 C/Kg

If an electron has initial velocity in a direction perpendicular to the direction of magnetic field, the path of an electron is

straight line

parabola

circle

helical

The motion of an electron is affected by

only by electric field

only by magnetic field

both electric and magnetic fields

Cross field

The electron passes undeviated in

no fields

magnetic field

electric field

cross field

An electron moves with constant velocity parallel to the direction of a uniform electric field(E).The force experienced by the electron is

EeV

eV/E

A free charged particle moves through a magnetic field.The particle may undergo a change

speed

energy

direction of motion

all given option

A cathode ray tube has p.d. of V volts between the cathode and anode.Then the speed(v) of cathode rays is given by

$v∝V$

$v\ ∝\ \ \frac{1}{V}$

v∝\sqrt{V}

$v∝\ \frac{1}{V^2}\$

The ratio of the specific charge of proton to that of an α-particle is

4:1

1:2

1:4

2:1

An electron is moving with a velocity v and enters a uniform electric field perpendicularly. Its trajectory within the field will be

parabolic

circular

straight line

helical

10.

The charged particle does not experience any force

in field free region

in electric field

in magnetic field

in cross field

11.

What is the formula for charge of oil drop when it moves downward when an electric field is applied?

$q=(6πη(v_1+v_2)r)/E$

$q=(6πηv_1r)/E$

$q=mg/E$

$q=(6πη(v_1-v_2)r)/E$

12.

If a direction of motion of electron makes an angle

\theta

so that

0^0

\theta

90^0

with the direction of magnetic field,What will be the nature of the path of electron

circular

parabolic

helical

straight line

13.

If a charged particle moves in a magnetic field, the force experience of it is given by

Bqvsin $\theta$

6 $\pi\eta$ rv

14.

Which properties are true for cathode rays ?

The cathode rays are the streams of negatively charged electrons.

They are not electromagnetic waves.

The cathode rays emitted from different cathode materials are identical.

All the given option

15.

An electron and a proton are projected in an electric field at right angles to field with same kinetic energy .Which particle has trajectory more curved?

An electron has trajectory more curved.

Proton has trajectory more curved.

Both have the same trajectory curved.

None of the given options

16.

An electron and a proton are injected into a uniform magnetic field with same kinetic energy at right angles to the field direction .Then which will trace greater curved trajectory?

An electron will trace greater curved trajectory.

The proton will trace greater curved trajectory.

Both have the same trajectory curved.

None of the given options.

17.

In Millikan's oil drop experiment a charged drop of mass 1.8x10^-14 Kg is stationary between its plates.The distance between its plates is 0.9cm and potential difference is 2 KV.The number of electrons in the drop is

500

18.

Proton with charge mass ration 9.6x10⁷C/Kg are related in a circular orbit of radius r,when enter a uniform magnetic field of 0.5T. The no. of revolution per second is

7.6x10⁴rev/s

7.6x10⁵rev/s

7.6x10⁶rev/s

7.6x10⁷rev/s

19.

A proton of mass 1.67x10^-27 kg and charge 1.6x10^-19 c is projected with a speed of 2x10⁶m/s at an angle of 60⁰ to the x –axis. The uniform magnetic field of 0.104 T is applied along the Y-axis. Calculate the radius of path.

10.04x10^-1 m

10.04x10^-2 m

10.04x10^-3 m

10.04x10^-4 m

20.

Electron of energy 3600 eV moves at right angle to magnetic field of flux density 2x10^-3T.

(m= 9.1x10^-31Kg,e=1.6x10^-19C).The radius of orbit is

0.1m

0.01m

0.001m

21.

A beam of electron moving with a velocity of 10⁷ms^-1, enters midway between two horizontal parallel plates in a direction parallel to the plates. Each plate is 5cm long. These plates are kept 2cm apart and a p.d of 90V is applied between them. Calculate the velocity of the electron beam with which it just grazes the edge of +ve plate.(e/m=1.8x10¹¹c/kg)

1.07x10⁵m/s

1.07x10⁶m/s

1.07x10⁷m/s

1.07x10⁸m/s

22.

An electron beam passes through a magnetic field of strength 2x10^-3T and an electric field of 3.4x10⁴ V/m acting simultaneously mutually perpendicular.If the path of electron beam remains undeviated,the speed of electron will be

1.7x10⁷ m/s

6.8 x10⁵m/s

6.8x10⁷ m/s

3x10⁸m/s

Reset

Electrons

Total questions: 22

Worksheet time: 28mins

Similar Resources on Wayground