A long, straight aluminium strip long is fixed along the north–south direction on…
PHYSICS · Multi-part · CBSE · Physics · Moving Charges and Magnetism · Moving Charges and Magnetism
Problem
A long, straight aluminium strip 0.40m long is fixed along the north–south direction on insulating supports in a region where two mutually perpendicular uniform magnetic fields exist simultaneously: B1=0.20T acting vertically upward and B2=0.15T acting due east.
(a) A current of 25A is sent through the strip from south to north. Determine the direction of the net force acting on the strip and describe qualitatively how the two magnetic fields together influence this direction.
(b) The current is now reversed while both magnetic fields remain the same. Predict the new direction of the force and compare its magnitude with that in part (a).
(c) Next, keeping the original current direction (south to north), B1 is reversed while B2 is unchanged. State how the direction and magnitude of the force will change.
(d) Finally, both the current and B1 are reversed simultaneously, while B2 is still eastward. Work out the resulting direction of the force and comment on whether its magnitude differs from that in part (a).