NEET Physics: Questions 268  271 of 2099
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Question number: 268
» Electrostatics » Electric Charges
Question
the magnitude of electric field intensity E is such that, when an electron placed in it, electron would experience an electrical force is equal to its weight is given by mg. So, what is the magnitude of this electric field?
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 269
» Kinematics » Average Speed and Instantaneous Velocity
Question
A lady is walking on a level road at a speed of 8 km/h. Raindrops fall vertically with a speed of 6 km/h. Find the velocity of raindrops with respect to the men.
Choices
Choice (4)  Response  

a.  4 km/hr  
b.  3 km/hr  
c.  10 km/hr  
d.  7 km/hr 
Question number: 270
Question
A parallel plate capacitor is charged to a potential. difference of 50V. It is discharged through a resistance. After 1 second, the potential difference between plates becomes 40V. Then
Choices
Choice (4)  Response  

a.  Potential difference between the plates after 2 seconds will be 20 V  
b.  Fraction of stored energy after 1 second is 16/25  
c.  Potential difference between the plates after 2 seconds will be 30V  
d.  Fraction of stored energy after 1 second is 4/5 
Question number: 271
» Electrostatics » Coulomb's Law
Question
An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. Calculate the Coulomb force F between proton and electron. (here
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d.  All of the above 