Other Physics Answers

A positive charge, q = +20 nC, is on the y-axis at y = +4.00 cm.

(a) Determine the magnitude and direction of the electric field at the origin.

(b) What will be the magnitude and direction of the electric field at the origin if the charge is -20 nC?

Two charges are on the x-axis. Charge q1 = +25 nC is at x = 4.00cm while charge q2 = -75nC is at x = 7.00 cm,

Find the magnitude and direction of:

a.) the electric force that q1 exerts on q2; and

b.) the electric force the q2 exerts on q1.

Illustration:

Free-body diagram:

a steel plug has a diameter of 5cm at 30°c .atehat temperature will it fit exactly into a hole of constant diameter 4.997cm ( coefficient of liner expansion of stee is 11×10-60C-1

A rain drop from 500m is not likely to attain a velocity of 100m/s2 explain.

SHOW SOLUTION:

1. Compute the resistance of a conductor given a resistivity of 10.4Ωm, length of 4m, and a diameter of 20mm.

2. A length of a gold wire (α = 3.4 x 10^

-3) has a resistance of 10 ohms at 25 degrees Celsius. Calculate resistance if the temperature rises to 90 degrees Celsius.

SHOW SOLUTION:

1. Compute the resistance of a conductor given a resistivity of 10.4Ωm, length of 4m, and a diameter of 20mm.

2. A length of a gold wire (α = 3.4 x 10^

-3) has a resistance of 10 ohms at 25 degrees Celsius. Calculate resistance if the temperature rises to 90 degrees Celsius.

How much charge flows from each terminal of a 12.0-V battery when it is connected to a 5.00-μF capacitor?

1. A carbon wire with a 3 mm diameter has a resistance of 100 ohms. How long is the wire?

2. A 200 m long aluminum wire has the same resistance and cross sectional area as a carbon wire. What is the length of the carbon wire?

3. A wire made of an unknown substance has a resistance of 125 mΩ. The wire has a length of 1.8m and a cross-sectional area of 2.35 x 10^-5 m^2. What is the resistivity of the substance from which the wire is made? Give your answer in scientific notation to one dicimal place.

A puck with a mass of 0.170 kg has a velocity of + 90.0 km/h. The momentumof the puck is

A closed coil of 40 turns and of area 200 cm2, is rotated in a magnetic field of flux density 2 Wb m-2. it rotates from a position where its plane makes an angle of 30° with the field to a position perpendicular to the field in atime 0.2 sec. Find the magnitude of the emf induced in the coil due to its rotation.