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Q. A 3.0A current is at right angles to a 0.55T magnetic field. The wire carrying the current is 1.0m long. How strong is the force that acts on the wire?

Q. Laser light at 635 falls on a double-slit apparatus with slit separation 6.9 .Find the separation between the third and fourth bright fringes, as seen on a screen 1.4 from the slits.

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