1)When an electron circles in a uniform circular motion, which describes its spe

Question

1)When an electron circles in a uniform circular motion, which describes its speed?

a)It increases with each full circle.

b)It decreases with each full circle.

c)It remains the same.

2)A wire with current lies in a uniform magnetic field. In which situation is the magnetic force on the wire zero?

a)When the length vector is perpendicular to a magnetic field line.

b)When the length vector is perpendicular to the magnetic field vector.

c)When the length vector is in the direction of the magnetic field vector.

3)A current loop is in a uniform magnetic field. Which describes the dependence of the torque on the loop

Explanation / Answer

1) c......... it is becoz if the speed decreases then electron may leave its orbit and goes into the inner orbits and similar case if speed increases...so best ans is C...

2)c.....it is because force= ilbsin(angle betweeen them)......so the length and mafnetic field must lie along same axis

3)b.....coz torque= k*current* flux.......so more no of turns more current so torque is proportional to current .....so answr is ...B..

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