An electric current passes through a long straight wire. At a distance 5 cm from the wire, the magnetic field is B. The field at 20 cm from the wire would be
A magnetic field of exerts a force on a particle having a charge 10−9C and moving in te x−y plane. Find the velocity of the particle.
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If a charge particle is describing a circle of radius r in a magnetic field with a time period T. Then :
Two wires of same length are shaped into a square and a circle. If they carry same current, ratio of the magnetic moment is
A positively charged particle falling freely under gravity enter a region having a uniform horizontal magnetic field pointing north to south the particle will be deflected towards
A charged particle enters a magnetic field H with its initial velocity making an angle of 45° with H the path of the particle will be :
A wire carrying current 4i and other carrying current 2i in the same direction produce a magnetic field B at the mid-point. What will be the field when 2i current is switched off?
A long metallic cylinder of radius R has a current i flowing through it. The magnetic induction B will vary with distance from the curve as shown in figure.
A proton and a deutron both having the same kinetic energy, enter perpendicularly into a uniform magnetic field B. For motion of proton and deutron on circular path of radius Rp and Rd respectively, the correct statement is :