HelpT_T (Scenario
Gigi is a grade 7 student who lives 250 meters away from their school, she
would always wake up early to walk to school with her friends. To go to school she
travels 20 m north of their house towards a store near the crossing, she then walks
30 meters west of the store unti, she arrives at a big blue house. From the north of
the big blue house she then walks 100 meters towards an eatery, and then walks
another 100 meters east of the eatery before arriving at their shool.)​

Search coils and credit cards. one practical way to measure magnetic field strength uses a small, closely wound coil called a search coil. the coil is initially held with its plane perpendicular to a magnetic field. the coil is then either quickly rotated a quarter-turn about a diameter or quickly pulled out of the field. (a) derive the equation relating the total charge q that flows through a search coil to the magnetic-field magnitude b. the search coil has n turns, each with area a, and the flux through the coil is decreased from its initial maximum value to zero in a time ∆t. the resistance of the coil is r, and the total charge is q = i∆t, where i is the average current induced by the change in flux. (b) in a credit card reader, the magnetic strip on the back of a credit card is rapidly “swiped” past a coil within the reader. explain, using the same ideas that underlie the operation of a search coil, how the reader can decode the information stored in the pattern of magnetization on the strip. (c) is it necessary that the credit card be “swiped” through the reader at exactly the right speed? why or why not?

In a series circuit the __ is the same at every point

What are the necessary conditions for fusion?