A 0.50-m long solenoid consists of 1 000 turns of copper wire wound with a 4.0 cm radius.
When the current in the solenoid is 18 A, the magnetic field at a point 1.0 cm from the central axis of the solenoid is:

a) 0.090 mT. b) 0.36 mT. c) 23 mT. d) 36 mT. e) 45 mT.

You are driving directly behind a pickup truck, going at the same speed as the truck. a crate falls from the bed of the truck to the road. (a) will your car hit the crate before the crate hits the road if you neither brake nor swerve? (b) during the fall, is the horizontal speed of the crate more than, less than, or the same as that of the truck?

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?