Author: Study Clue

A rotating-coil generator has peak emf E0=NBAωE0=NBAω. If only angular speed ωω is tripled (N, B, A unchanged), peak emf

A circular loop is rotated in a uniform magnetic field; magnetic flux through the loop varies as A Constant only

A rectangular coil enters a uniform magnetic field region with constant speed; induced emf depends mainly on A Coil resistance

When coil turns faster in a uniform field, the induced emf amplitude mainly A Decreases always B Becomes zero C

In electromagnetic induction, induced emf appears mainly due to change in which quantity A Magnetic flux B Electric potential C

A long straight wire carries current I. At a point P, distance from wire becomes half and current becomes half.

For a circular loop (radius R, current I), magnetic field on axis at distance x is A μ0I/2xμ0I/2x B μ0I/2πxμ0I/2πx

When observation point lies on extension of current element direction, Biot–Savart law gives field contribution as A Zero value B

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In Biot–Savart law, magnetic field contribution mainly depends on A Current element direction B Total charge only C Square of