Emmett Bradley

2023-02-21

Two identical conducting spheres A and B are separated by a distance greater than their diameters the spheres carry equal charges and electrostatic force between them is F a third identical uncharged sphere C is first brought in contact with A, then with B and finally removed as a result, the electrostatic force between A and B becomes

placerdeleermvau

Beginner2023-02-22Added 7 answers

C was the first to make contact with A. Touching removed half of the charge, and then touching B removed a quarter of the total charge.

A will be reduced to 3/4th and B become half.

The total charge it took is 3F/8

A will be reduced to 3/4th and B become half.

The total charge it took is 3F/8

The magnetic field inside a long straight solenoid carrying current

A)is zero

B)increases along its radius

C)increases as we move towards its ends

D)is the same at all pointsWhich of the following units is used to express frequency?

Hertz

Watt

Newton

PascalWhat does tangential force produce?

How Many Different $f$ Orbitals Are There?

What is $\frac{e}{m}$ value for electrons ?

Which of the following correctly describes the magnetic field near a long straight wire?

A. The field consists of straight lines perpendicular to the wire

B. The field consists of straight lines parallel to the wire

C. The field consists of radial lines originating from the wire

D. The field consists of concentric circles centered on the wireIs energy directly proportional to frequency?

What is a compass? How is a compass used to find directions?

Magnetic field lines never intersect each other because

There will be two directions of the field at the same point.

Feild lines repel each other

Field lines follow discrete paths only

If field lines intersect they create a new magnetic field within the existing fieldTwo parallel wires carry currents of 20 A and 40 A in opposite directions. Another wire carrying a current antiparallel to 20 A is placed midway between the two wires. The magnetic force on it will be

Towards 20 A

Towards 40 A

Zero

Perpendicular to the plane of the currentWhat is the wavelength of the light emitted when an electron in a hydrogen atom undergoes transition from the energy level n = 4 to energy level n = 2? What is the colour corresponding to their wavelengths? (Given ${R}_{H}=109677c{m}^{-1}$)

A) 486 nm, Blue

B) 576 nm, Blue

C) 650, Blue

D) 450 nm, BlueWhy is alternating current used in homes?

Which of the following radiation has the shortest wavelength.

X-ray

Infra red

microwave

ultravioletHow to find the local extrema for $f\left(x\right)=5x-{x}^{2}$?

Equation $F=ILB$ holds true only if: A. direction of electric current makes an angle of 30 degrees with the direction of magnetic field. B. direction of electric current makes an angle of 120 degrees with the direction of magnetic field. C. direction of electric current is perpendicular to the direction of magnetic field. D. direction of electric current is parallel to the direction of magnetic field.