Home
Class 12
PHYSICS
An electron is projected with uniform ve...

An electron is projected with uniform velocity along the axis of a current carrying long solenoid. Which of the following is true ?

A

The electron will be accelerated along the axis.

B

The electron path will be circular about the axis.

C

The electron will experience a force at `45^(@)` to the axis and hence execute a helical path.

D

The electron will continue to move with uniform velocity along the axis of the solenoid.

Text Solution

Verified by Experts

The correct Answer is:
D
The Lorentz force acts on a charged particle in a magnetic and electric field is,
`vecF=q[vecE+(vecVxxvecB)]`
As there is no E,
`vecF=q(vecVxxvecB)`
`F=-evBsintheta`
= `-evBsintheta`
F = 0
So, according to first law of Newton it will continue its motion with constant velocity.
Promotional Banner

Topper's Solved these Questions

  • MOVING CHARGES AND MAGNETISM

    KUMAR PRAKASHAN|Exercise SECTION C (VERY SHORT ANSWER TYPE QUESTIONS)|5 Videos

  • MOVING CHARGES AND MAGNETISM

    KUMAR PRAKASHAN|Exercise SECTION C (SHORT ANSWER TYPE QUESTIONS)|6 Videos

  • MOVING CHARGES AND MAGNETISM

    KUMAR PRAKASHAN|Exercise SECTION B (NUMERICAL FROM .DARPAN. BASED ON TEXTBOOK)|13 Videos

  • MAGNETISM AND MATTER

    KUMAR PRAKASHAN|Exercise SECTION D Multiple Choice Questions (MCQs) (MCQs asked in Competitive Exams) MCQs asked in Board Exam and GUJCET|7 Videos

  • RAY OPTICS AND OPTICAL INSTRUMENTS

    KUMAR PRAKASHAN|Exercise SECTION-D (MULTIPLE CHOICE QUESTIONS (MCQs))(MCQs ASKED IN COMPETITIVE EXAMS)|142 Videos

Similar Questions

Explore conceptually related problems

Write the equation of magnetic field on the axis of current carrying finite solenoid.

An electron moving with a velocity v along the positive x -axis approaches a circular current carrying loop as shown in the fig. the magnitude of magnetic force on electron at this instant is

Electromagnet consists of a current - carrying solenoid with Alnico rod (an alloy) put in it . true or false?

When a disc rotates with uniform angular velocity, which of the following is not true?

Out of the following , which statement is wrong for a current - carrying solenoid ?

Mention two ways to increases the strength of the magnetic field of a current - carrying solenoid .

Whose magnetic field resembles the magnetic field of a current - carrying solenoid ?

When an iron placeis introuduced inside a current - carrying solenoid the mangetic field of the solenoid ……… .

What is a solenoid ? Discuss the magnetic field due to a current - carrying solenoid .

How does a solenoid behave like a magnet ? Can you determine the north and south poles of a current - carrying solenoid with the help of a bar magneti ? Explain.