Electricity and Magnetism Answers

An electrically neutral metallic solid undergoes induction after which it loses l0'electrons. What is

the total charge on the metallic solid?

1. Find the cost to run a 1200-watt microwave oven, if you make microwave popcorn in 5 minutes.

(price per kWh is 13.267 cents)

A 1.5 nC particle with an initial velocity of 4.75x106 m/s along the positive x-axis enters a region of uniform magnetic field and electric field The magnetic field is 3.25 T along the positive y-axis calculate the magnitude and direction of the electric field if the particle passes the region undeflected

A circular loop of wire of radius 0.25 cm is expected to an external magnetic field that is perpendicular to the plane of the loop. For a time, the magnetic field decreases at a rate of 0.0035 T/s. What is the magnitude of the induced electromagnetic force in the loop?

Correct the given Solution:

Solution:

F= SB cos α,

S =πr²,  α= 0°

F= SB cos α

 or F=πr² B

F = (3.14) (0.25) ²  (0.0035)

F= 0.000686875

Or

F= 6.9 x 10^-8 N

A flexible rectangular coil of wire with 150 loops is stretched in such a way that its dimension changes from 5 cm x 8 cm to 7 cm x 11 cm in 0.15 s in a magnetic field of 25T that is 30 degrees relative to the plane of the coil.

a. Calculate the induced EMF

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Given:

Solution:

A circular antenna of an area 3m2 is installed at a place in NAIA. The plane of an area of antenna is inclined at 47% with the direction of the Earth’s magnetic field. If the magnitude of the earth’s flux linked with the antenna (1nT= 1 x 10-9 T).

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Given:

Solution:

A circular loop of wire of radius 0.25 cm is expected to an external magnetic field that is perpendicular to the plane of the loop. For a time, the magnetic field decreases at a rate of 0.0035 T/s. What is the magnitude of the induced electromagnetic force in the loop?

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Given:

Solution:

A flexible rectangular coil of wire with 150 loops is stretched in such a way that its dimension changes from 5 cm x 8 cm to 7 cm x 11 cm in 0.15 s in a magnetic field of 25T that is 30 degrees relative to the plane of the coil.

a. Calculate the induced EMF

b. How much energy in joules was dissipated in the circuit if the total resistance is 100Ω?

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Given:

Solution:

A proton moves through a magnetic field of magnitude 4.5 T at a speed of 7.08×10^6 m/s

Perpendicular to the field. Find the

a. Centripetal acceleration

b. Radius of the circular path of the proton

Rectangular plate has a voltage of +180V and another rectangular plate (parallel to

plate to the first plate) has a voltage of -5V. Determine the field strength at any point

between these two plates? The distance of separation of the plates is finite, say 8.6mm