12th Class Physics MCQS Chapter 1

An electric field cannot deflect

ß-particles

a-particles

X-rays

None of these

Electric potential at a distance ”r” from ”q” is:

Vr=1/4??_?²q/r

V_r = 1/54??_?q/r₂

V_r=1/4??_?q²/r

V_r=1/4??_?2q/r

A charge Q is divided into tweo parts q and Q-q and seperated by a distance R. The force of equilibrium between them will be maximum when:

q=Q/4

None of these

q=Q/2

q=Q

The leV =

1.6×10-11C

1.6×10-11J

1.6×10-19C

1.6×10-19J

When the medium is insulator the elecrostatic force between the charges is

None of above

Zero

Increased

Decreased

The electric intensity at infinite distance from the point charge is

Positive

Zero

Negative

Infinite

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, Then

Potencial difference between the plates decreases, stored energy decreases and charge remains unchanged

None of them

Potencial difference between the plates increase, stored energy decreases and charge remains the same

The charge in the plates reduces and potencial difference increase

The electric field created by positive charge is:

Circular

Radially inward

Zero

Radially outward

The “toner” of photocopier is given:

Positive charge

Negative charge

Remains neutral

All of above 

Concept of electric field lines was given by:

Michelson

Michael faraday

Henry

Oersted