Electricity and Magnetism Answers

How much work is needed to move a −9.5 charge from ground to a point whose potential is +75 V. 

A large horseshoe magnet produces a magnetic field of strength 2×10−2 T in the region between the poles of the magnet. A wire of 5 cm length is placed in the field at the right angle to the field lines and carries a current of 15 mA. Calculate the force acting on a wire.

Current of 50A flows to east on stationery wire . A second wire is 1cm below it . How much current must be flowing in the second wire so that doesn't fall due to gravity ? What is the direction of the current ? The mass per unit length of the second wire is 5g/m

Light that is nonpolarized has an intensity of 6.0 W/m2. Rays of this

light are incident on two polarizing elements whose transmission

axes are at an angle of 450. What is the intensity of light emerging

from the second film?

An electric wire in the wall of a building carries a current of 25A vertically upward. What is the magnetic field due to this current at point P 10cm due north of the wire

Find the measurement of the angle of refraction using the given illustration.

N

\ |

Air (n=1.00) \ |

\ |

_____________ \ | _____________

Crown |

Glass (n= 1.52) |

|

There is a lead XY of the shape of a long straight line and a doubly-rolled circular lead whose center is O with radius 0.10 m. They are in the same plane and the distance between XY and O is 0.20 m. A current of 15.7 A is flowing in lead XY to the direction shown in the figure below. Set the circle ratio is 3.14. Find the strength of the magnetic field which the straight line current builds at the center O of the circle.

A person plugged in a 1250 W hair dryer and a 2500 W electric heater in the same 120 V outlet

protected by a 7.5 A circuit breaker. Will the breaker trip?

A cell has a terminal voltage of 50.0 V for a current of 10.0 A and 54 V for a current of 6.0 A. Find the electromotive force and internal resistance of the cell.

A proton is located at the point (x = 1.0 nanometres, y = 0.0 nanometres) and an electron is

located at the point (x = 0.0 nanometres, y = 4.0 nanometres). Find the magnitude of the

electrostatic force that each one exerts on the other. (k = 1/4πε0 = 9.0 × 109 N ∙ m2/C2, e = 1.6

× 10-19 C)