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When a charged particle enters in a uniform magnetic field, its kinetic energy

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Important Questions on Magnetic Effect of Current

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Two particles x and y have equal charges and possessing equal kinetic energy enter in a uniform magnetic field and describe circular path of radius of curvature r1 and r2 respectively. The ratio of their masses is :- 
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Flux passing through loop is proportional to 

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Two long wires hating current as shown placed at separation 2 m. The magnetic field at mid-point is:-
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A square loop of resistance 11 Ω having area 0.15 m2 is placed in magnetic field of 2T. Find frequency by which it should be rotated so that average power dissipated in it is 100 W. 
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Assertion: Charge is invariant.

Reason: Charge does not depend on speed or frame of reference.

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 An electron having mass m and kinetic energy E enters in uniform magnetic field B perpendicularly. Then, its frequency of uniform circular motion will be,
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In a mass spectrograph, an ion A of mass number 24 and charge +e and an ion B of mass number 22 and charge +2e enter in transverse magnetic field with same velocity. The ratio of radii of their paths, respectively, is
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A charged particle is moving in the direction of a magnetic field. The magnetic force acting on the particle,