Related InterviewSolutions

• A charged particle P leaves the origin with speed `v=v_0` at some inclination with the x-axis. There is a uniform magnetic field B along the x-axis. P strikes a fixed target T on the x-axis for a minimum value of `B=B_0`. P will also strike T ifA. `B=2B_(0),v=2v_(0)`B. `B=2B_(0),v=v_(0)`C. `B=B_(0),v=2v_(0)`D. `B=B_(0)//2, v=2v_(0)`
• A charged particle entering a magnetic field from outside in a direction perpendicular to the fieldA. can never complete one rotation inside the fieldB. may or may not complete one rotation in the field dependent on its angle of entry into the fieldC. will always complete exactly half of a rotatioin before leaving the fieldD. may follow a helical path depending on its angle of entry into the field
• A particle with a specific charge s is fired with a speed v toward a wall at a distance d, perpendicular to the wall. What minimum magnetic field must exist in this region for the particle not to hit the wall?A. `v//sd`B. `2v//sd`C. `v//2sd`D. `v//4sd`
• A ring of area `A` and resistance `R` is placed on the axis of a solenoid. The mutual inductance between them is `M`. When the current in the solenoid changes at the rate of `I`, the magnetic moment of the ring isA. `ARMI`B. `AI//RM`C. `MRI//A`D. `AMI//R`
• A metal rod of length `l` pivoted at is upper end. It is released from a horizontal position. There is a uniform magnetic field `_|_` to its plane of rotation. When it becomes vertical, the p.d. across its ends is proportional toA. `l^(1//2)`B. `l`C. `l^(3//2)`D. `l^(2)`
• A charged particle begins to move in a magnetic field, initially parallel to the field. The direction of the field now begins to change, with its magnitude remaining constantA. The magnitude of the force acting on the particle will remain constant.B. The magnitude of the force acting on the particle will change.C. The particle will always move parallel to the field.D. The speed of the particle will change.
• The flux linked with a coil is `0.8Wb` when `2A` current flows thorugh it. If this current begins to increase at the rate of `0.4A//s`, the emf induced in the coil will beA. `0.02V`B. `0.04V`C. `0.08V`D. `0.16V`
• A long, narrow beam of electrons, of uniform cross-section consists of electrons moving with velcity `v` (`c=` velocity of light ). The ratio of the electric field to the magnetic field at any point near the beam isA. `v`B. `c`C. `c^(2)//v`D. `v^(2)//v`
• A thin, straight conductor lies along the axis of a hollow conductor of radius `R`. The two carry equal currents in the same direction. The magnetic field `B` is plotted against the distance `r` from the axis. Which of the following best represents the resulting curve?A. B. C. D.
• A rectangular, horizontal conducting frame carries current, flowing clockwise as seen from above,. `P` is a point vertically above the centre of the frame. The direction of the magnetic field at `P` due to the current isA. vertically upwardsB. horizontal, prallel to the loner sides of the frameC. vertically downwardsD. horizontal parallel to the diagonal of the frame