Multiple Choice QuestionsChoose the correct alternative:Â
Intensity of electric field at a point at a perpendicular distance 'r' from an infinite line charge, having linear charge density 
 is given by,Â
E = 
E = 
E =Â
If R1 and R2 are filament resistance of a 200 W and a 100 W bulb respectively, designed to operate on the same voltage.Â
R1 = R2
R2 = 2R1
R2Â = 4R1
R2Â = 4R1
A metallic wire having length of 2 m and weight of 4 x 10-3 N is found to remain at rest in a uniform and transverse magnetic field of 2 x 10-4 T. Current flowing through the wire is:Â
10 A
5 A
2 A
2 A
When a beam of white light is passed through sodium vapours and then through a spectrometer, spectrum so obtained has two dark lines present in the yellow region. this spectrum is called:Â
band spectrum
continuous spectrum
absorption spectrum of sodium
absorption spectrum of sodium
If I3 and I2 represent angular momenta of an orbiting electron in III and II Bohr orbits respectively, then I3 : I2 is,
3:2
9:4
2:3
2:3
Short Answer TypeA parallel plate capacitor has a capacitance of 5 
. It becomes 50 
 when a dielectric medium occupies the entire space between its two plates. What is the dielectric constant of the medium?Â
Initial capacitance, C =Â Â 5Â 
Capacitance when dielectric is insrted = 50Â 
Using the formula,
K = C/Co = 50 / 5 = 10
Two substances A and B have their relative permeabilities slightly greater and slightly less than 1 respectively.
What do you conclude about A and B as far as their magnetic materials are concerned ?
When does a moved charged particle not experience force while moving through a uniform magnetic field.
What is the turns ratio i.e., transformer ratio, ns : np in an ideal transformer which increases AC voltage from 220 V to 33000 V?
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