According to the biot-savart force law and the right hand rule, if a magnetic field is directed rightward (+ x axis) and a positive test charge moves through the field downwards (- y axis), which direction will the magnetic force be applied onto the charge? 1. upwards (+ y axis) 2. leftward (- x axis) 3. out of the screen (+z axis) 4. into the screen (- z axis)

3. out of the screen (+z axis)

Explanation:

As we know that magnetic force on a positive moving charge is given by

here we know that

= Towards right (+X)

= downwards (-Y)

charge is given as positive charge

now as per above formula we have

so the force will be out of the screen (+Z) direction

your answer would be fusion

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation: