When the north pole of a bar magnet is moved into a solenoid, the needle on a galvanometer attached to the solenoid moves to the left, indicating that a current is produced. the magnet is then pulled out at a faster speed. what will be the result? a) a larger current in the same direction b) a larger current in the opposite direction c) a smaller current in the same direction d) a smaller current in the opposite direction.

B.) a larger current in the opposite direction.

Explanation:

When a magnet is placed close to the solenoid electricity is induced, when the magnet moves towards the solenoid the current induced is of a positive value though very little and can only be measured by a galvanometer (a device for measuring small charges).

When the magnet is withdrawn in the opposite direction at a higher speed, a negative charge of a higher magnitude is produced in the solenoid and galvanometer moves in the opposite direction.

(B ) a large current in the opposite direction

Explanation:

When the magnet is pulled out at a faster speed the north pole becomes the south pole which tries to hold the magnet back. The induced current oppose the motion that induces it from Lenz law of electromagnetic induction. This makes the pointer to deflect in the opposite direction.

need to see circuit to get time constant

laticia draws the diagram below to show earth’s magnetic field.

answer

the arrows to the right of earth should point up.