Download App

Electric Charges and Fields — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsElectric Charges and Fields1 Mark
MCQ
A proton and an electron are placed in a uniform electric field.
  • A
    The electric forces acting on them will be equal.
  • B
    The magnitudes of the forces will be equal.
  • C
    Their accelerations will be equal.
  • D
    The magnitudes of their accelerations will be equal.
✓

Answer

  1. The magnitudes of the forces will be equal.

Explanation:

Proton contain positive charge = 1.6 × 10-19 = e

Electron contain negative charge = -1.6 × 10-19 = -e

Force inoniforma electric field is = qE

$\therefore\ $The Magniludes of Electric force is equal But direction of electric force is opposite to each other.

mass of proton = 1.67 × 10-27Kg.

mass of electron = 9.1 × 10-31Kg.

So that Magnitudes of their acceleration will be unequal.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q [1M]" from Electric Charges and Fields→Electric Charges and Fields — all question types→Physics STD 12 Science question papers→Bihar Board STD 12 Science question papers→Bihar Board question paper generator→

Similar questions

In electrolysis, if the duration of the passage of current is doubled, the mass liberated i

(a) Doubled

(b) Halved

(c) Increased four times

(d) Remains the same
→

If an electron and a photon propagate in the form of waves having the same wavelength, it implies that they have the same

(a) Energy

(b) Momentum

(c) Velocity

(d) Angular momentum
→

A torch bulb rated as 4.5 W, 1.5 V is connected as shown in the figure. The e.m.f. of the cell needed to make the bulb glow at full intensity is

(a) 4.5 V

(b) 1.5 V

(c) 2.67 V

(d) 13.5 V
→

The process of adding impurities to the pure semiconductor is called

(a) Drouping

(b) Drooping

(c) Doping

(d) None of these
→

Five identical plates each of area A are joined as shown in the figure. The distance between the plates is d. The plates are connected to a potential difference of V volts. The charge on plates 1 and 4 will be

(a)  

(b)  

(c)  

(d)  
→
When air in a capacitor is replaced by a medium of dielectric constant K, the capacity
→

If  millimho, then on increasing plate voltage by  50 V, how much the grid voltage is changed so that plate current remains the same

(a) – 2.86 V

(b) –  4 V

(c) + 4 V  

(d) + 2 V
→
Two like charges are placed a certain distance apart in air. If a brass plate is introduced between them, the force between the two charges will:
→

An electron of mass m when accelerated through a potential difference V has de-Broglie wavelength λ. The de-Broglie wavelength associated with a proton of mass M accelerated through the same potential difference will be

(a) λ      

(b) λ 

(c)  λ     

(d)  λ
→

When a PN junction diode is reverse biased

(a) Electrons and holes are attracted towards each other and move towards the depletion region

(b) Electrons and holes move away from the junction depletion region

(c) Height of the potential barrier decreases

(d) No change in the current takes place

→