Which of the following would increase the current generated

Which of the following would increase the current generated in the coil? increase the speed of rotation of the wire loop increase the size of the coil increase the strength of the magnetic field i) only ii)only i) and ii)only i), ii) and iii) A conducting bar is slid at a constant velocity v along two conducting rods. The rods are separated by a distance t and connected across a resistor R. The entire apparatus is placed in an external magnetic field B directed into the page. How will the current in the apparatus be generated? sinusoidally clockwise (up through the resistor) counter clockwise (Down through the resistor There is not enough information to determine the direction of the current A magnet is pulled through a stationary, conducting ring at a constant velocity. In which direction will the current in the ring be generated when the magnet moves completely through the ring? Clockwise then counter clockwise counter clockwise then clockwise clockwise only counter clockwise only

Solution

1.11 emf produced

E = d/dt   where = B*A

B is the magnetic field and A is the area of the coil.

E is proportional to the magnetic field B

Proportional to area A

Proportional to the speed

current will increase by increasing any of the three

answer d) I,ii,iii

1.12 the direction of the induced current is such that it opposes the change that induced it.

The flux is increasing, the direction of the induced current is to produce a magnetic field in opposite direction to the original field i.e. out of the page.

hence the current is CCW down the resistor.

answer (c)

1.13 Magnetic field is to the right, the induced current will produce field in opposite direction as the magnet moves in.

a) clockwise and then counter clockwise

1.14

c) magnetic field created by i1 creates a net force on 2 only