Home
Class 11
PHYSICS
A particle of mass m and charge q has an...

A particle of mass m and charge q has and initial velocity `vecv = upsilon_(0)hatj`. If an electric field `vec E=vec_(0) hat i` and magnetic field `vec B=B_(0)hat i` act on the particle, its speed will double after a time :

A

`t= (2mv_(0))/(qE)`

B

`t= (2Bq)/(mv_(0))`

C

`t= (sqrt3Bq)/(mv_(0))`

D

`t= (sqrt3mv_(0))/(qE)`

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • MAGNETIC EFFECT OF CURRENT AND MAGNETISM

    DC PANDEY ENGLISH|Exercise More than One Option is Correct|25 Videos

  • MAGNETIC EFFECT OF CURRENT AND MAGNETISM

    DC PANDEY ENGLISH|Exercise Comprehension type Questions|16 Videos

  • MAGNETIC EFFECT OF CURRENT AND MAGNETISM

    DC PANDEY ENGLISH|Exercise Integer type Questions|10 Videos

  • LAWS OF THERMODYNAMICS

    DC PANDEY ENGLISH|Exercise Level 2 Subjective|18 Videos

  • MEASUREMENT AND ERRORS

    DC PANDEY ENGLISH|Exercise Subjective|19 Videos

Similar Questions

Explore conceptually related problems

A particle ( mass = m and charge = q ) is moving in a region in which there exists a uniform electric field E vec( i ) and a uniform magnetic field B hat (k) . At t = 0 , the particle is at ( 0,a ) and is moving with v hat(i) . After some time, the particle is located at ( 2a, 0 ) and has a velocity - 2 v hat( j ) , then which of the following is true ?

A particle of charge q and mass m starts moving from the origin under the action of an electric field vec E = E_0 hat i and vec B = B_0 hat i with a velocity vec v = v_0 hat j . The speed of the particle will become 2v_0 after a time.

A particle of charge q and mass m starts moving from the origin under the action of an electric field vec E = E_0 hat i and vec B = B_0 hat i with a velocity vec v = v_0 hat j . The speed of the particle will become 2v_0 after a time.

A charged particle moves with velocity vec v = a hat i + d hat j in a magnetic field vec B = A hat i + D hat j. The force acting on the particle has magnitude F. Then,

A charged particle moves with velocity vec v = a hat i + d hat j in a magnetic field vec B = A hat i + D hat j. The force acting on the particle has magnitude F. Then,

A positively charged particle is moving along the positive x-axis in a unifom electric field vec E= E_0hatj and magnetic field vec B = B_0hat k (where E_0 and B_0 are positive constants), then

In uniform magnetic field, if angle between vec(v) and vec(B) is 0^(@) lt 0 lt 90^(@) , the path of particle is helix. Let v_(1) be the component of vec(v) along vec(B) and v_(2) be the component perpendicular to vec(B) . Suppose p is the pitch. T is the time period and r is the radius of helix. Then T = (2pim)/(qB), r = (mv_(2))/(qB), P = (v_(1))T Assume a charged particle of charge q and mass m is released from the origin with velocity vec(v) = v_(0) hat(i) - v_(0) hat(k) in a uniform magnetic field vec(B) = -B_(0) hat(k) . Pitch of helical path described by particle is

The potential field of an electric field vec(E)=(y hat(i)+x hat(j)) is

The potential field of an electric field vec(E)=(y hat(i)+x hat(j)) is

An alpha particle moving with the velocity vec v = u hat i + hat j ,in a uniform magnetic field vec B = B hat k . Magnetic force on alpha particle is

DC PANDEY ENGLISH-MAGNETIC EFFECT OF CURRENT AND MAGNETISM-Only One Option is Correct
  1. The dimensions of (B^(2)R^(2)C^(2))/(2mu(0)) (Where B is magnetic f...

    Text Solution

    |

  2. A conducting rod of length l and mass m is moving down a smooth inclin...

    Text Solution

    |

  3. A particle of mass m and charge q has and initial velocity vecv = upsi...

    Text Solution

    |

  4. A rigid circular loop of radius r and mass m lies in the XY- plane of ...

    Text Solution

    |

  5. A current carrying squre loop is placed near an infinitely long curre...

    Text Solution

    |

  6. A conducting rod of mass m and length l is placed over a smooth horizo...

    Text Solution

    |

  7. Choose the correct option: A particle of charge per unit mass alpha i...

    Text Solution

    |

  8. A particle of charge per unit mass alpha is released from the origin w...

    Text Solution

    |

  9. Two wires AO and OC carry equal currents i as shown in Fig. One end of...

    Text Solution

    |

  10. Choose the correct option: Figure shows a square current carrying lo...

    Text Solution

    |

  11. A conducting ring of mass 2kg and radius 0.5m is placed on a smooth pl...

    Text Solution

    |

  12. A charge praticule of sepeific charge (charge/ mass ) alpha is rea...

    Text Solution

    |

  13. Magnetic moment of an electron in nth orbit of hydrogen atom is

    Text Solution

    |

  14. Two very long straight parallel wires carry steady currents i and 2i i...

    Text Solution

    |

  15. In Fig. a coil of single turn is wound on a sphere of radius r and mas...

    Text Solution

    |

  16. A particule having charge q enters a rection of untiormal magnetic...

    Text Solution

    |

  17. A particle of specific charge (charge/mass) alpha starts moving from t...

    Text Solution

    |

  18. A conducting wire bent in the from of a parabola y^(2)=2x carries a cu...

    Text Solution

    |

  19. A rectangular loop PQRS made from a uniform wire has length a, width b...

    Text Solution

    |

  20. A circular loop of radius R carrying a current I is placed in a unifor...

    Text Solution

    |