This diagram shows a square coil about to enter a region of uniform magnetic field of magnetic flux density $0.30T.$ The magnetic field is at right angles to the plane of the coil. The coil has $150$ turns and each side is$2.0cm$ in length. The coil moves at a constant speed of $0.50m{s}^{-1}$

(c) Determine the induced e.m.f. across the ends of the coil. 

This diagram shows a square coil about to enter a region of uniform magnetic field of magnetic flux density $0.30T.$ The magnetic field is at right angles to the plane of the coil. The coil has $150$ turns and each side is$2.0cm$ in length. The coil moves at a constant speed of $0.50m{s}^{-1}$

(d) Explain the induced e.m.f. across the ends of the coil when it is completely within the magnetic field

This diagram shows a square coil about to enter a region of uniform magnetic field of magnetic flux density $0.30T.$ The magnetic field is at right angles to the plane of the coil. The coil has $150$ turns and each side is$2.0cm$ in length. The coil moves at a constant speed of $0.50m{s}^{-1}$

(e) from the instant that the coil enters the magnetic field. Your time axis should go from $0 \text{to} 0.8 s.$

(a) State Faraday's law of electromagnetic induction.

(b) A circular coil of diameter $200mm$ has $600$ turns is shown. It is placed with its plane perpendicular to a horizontal magnetic field of uniform flux density $50mT.$. The coil is then rotated through $90°$ about a vertical axis in a time of$120ms$

(i) the magnetic flux passing through the coil before the rotation

(b) A circular coil of diameter $200mm$ has $600$ turns is shown. It is placed with its plane perpendicular to a horizontal magnetic field of uniform flux density $50mT.$. The coil is then rotated through $90°$ about a vertical axis in a time of$120ms$

(ii) the change of magnetic flux linkage produced by the rotation

(b) A circular coil of diameter $200mm$ has $600$ turns is shown. It is placed with its plane perpendicular to a horizontal magnetic field of uniform flux density $50mT.$. The coil is then rotated through $90°$ about a vertical axis in a time of$120ms$

(iii) the average magnitude of the induced e.m.f. in the coil during the rotation.

A bicycle wheel is mounted vertically on a metal axle in a horizontal magnetic field, as shown in the diagram. Sliding connections are made to the metal edge of the wheel and to the metal axle.

(a) (i) Explain why an e.m.f. is induced when the wheel rotates.

A bicycle wheel is mounted vertically on a metal axle in a horizontal magnetic field, as shown in the diagram. Sliding connections are made to the metal edge of the wheel and to the metal axle.

(a) (ii) State and explain two ways in which this e.m.f. can be increased.