Home
Class 12
PHYSICS
Work done on an electron moving in a sol...


Work done on an electron moving in a solenoid along its axis is equal to

A

zero

B

evB

C

i/B

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A
Net force acting on electron is zero
`F = q(vec(v) xx vec(B))`
`= q (VB) sin theta^(0)`
F = 0
W = F.S = 0
Promotional Banner

Topper's Solved these Questions

  • MOVING CHARGES AND MAGNETISM

    PHYSICS WALLAH|Exercise NEET PAST 5 YEARS QUESTIONS |12 Videos

  • MOVING CHARGES AND MAGNETISM

    PHYSICS WALLAH|Exercise NEET PAST 5 YEARS QUESTIONS |12 Videos

  • MOTION IN A STRAIGHT LINE

    PHYSICS WALLAH|Exercise NEET Past 5 Years Questions|5 Videos

  • OSCILLATIONS

    PHYSICS WALLAH|Exercise NEET PAST 5 YEARS QUESTIONS |5 Videos

Similar Questions

Explore conceptually related problems

Assertion : Work done by the centripetal force in moving a body along a circle is always zero. Reason : Because displacement of the body is along the force.

A current of 1.6 A flows through a long solenoid, having 8 turns/cm. The magnetic induction at the end of the solenoid along its axis is

A body constrained to move along Y- axis is subjected to a constant force (5,2,3)N. The work done by this force in moving body a distance 6m along Y - axis is

Statement I: An emf is induced ina long solenoid by a bar magnet that moves while totally inside the solenoid along axis of the solenoid. Statement II: as the magnet moves inside the solenoid the flux through turns of the solenoid changes.

A direct current flowing through tbe winding of a long cylindrical solenoid ofradius R produces a uniform magnetic induction B in it. An electron travelling at velocity v enters into tbe solenoid along the radial direction between its turn at right angles to the solenoid axis. After a certain time tbe electron deflected by magnetic field leaves the solenoid. Calculate the time which the electron spends inside the solenoid.

In a unit time, the work done by 3 men and 5 women is equal to the work done by 2 men and 7 women. The work done by one man is equal to the work done by ……………… women.

When an electron beam is moving in a magnetic field, then the work done is equal to the -

A body constrained to move along y-axis is subjected to a constant force vecF= -hati+2hatj+3hatk N . The work done by this force in moving the body a distance of 4 m along y-axis is

PHYSICS WALLAH-MOVING CHARGES AND MAGNETISM -LEVEL - 2
  1. A wire of length L metre , carrying a current I ampere is bent in the...

    Text Solution

    |

  2. Work done on an electron moving in a solenoid along its axis is equal ...

    Text Solution

    |

  3. A circular coil carrying a certain current produces a megnetic field B...

    Text Solution

    |

  4. An electric current passes through a long straight copper wire. At a d...

    Text Solution

    |

  5. Two wires of same length are shaped into a square and a circle. If the...

    Text Solution

    |

  6. An electron is revolving round a proton, producing a magnetic field of...

    Text Solution

    |

  7. A proton of energy 2 MeV is moving perpendicular to uniform magnetic f...

    Text Solution

    |

  8. A moving charge will gain energy due to the application of

    Text Solution

    |

  9. The radius of a circular loop is r and a current i is flowing in it. T...

    Text Solution

    |

  10. A long straight cable contains 7 strands of wire each carrying a curre...

    Text Solution

    |

  11. The maximum velocity to which a proton can be accelerated in a cycl...

    Text Solution

    |

  12. A cyclotron can accelerate

    Text Solution

    |

  13. Two thin long parallel wires separated by a distance b are carrying a ...

    Text Solution

    |

  14. In the given figure, the loop is fixed but straight wire can move. The...

    Text Solution

    |

  15. The deflection in a moving coil galvanometer is

    Text Solution

    |

  16. A galvanometer has 30 divisions and a sensitivity 16 mu A //"div". It ...

    Text Solution

    |

  17. If resistance of voltmeter is 10000 Omega and resistance of ammeter is...

    Text Solution

    |

  18. A voltmeter of range 2 V and resistance 300 Omega cannot be converted ...

    Text Solution

    |

  19. A long solenoid carrying a current produces a magnetic field B alon...

    Text Solution

    |

  20. An electric current passes through a long straight copper wire. At a d...

    Text Solution

    |