Top cliff electricals

08․ Electric field inside a hollow metallic charged sphere is
A. increasing towards centre.
B. decreasing towards centre.
C. zero.
D. none of above.

Hint:
Inside a hollow metallic charged sphere, that will not allow the outside electric field because of the charge separation of electrons and holes at the surface of sphere and creating an equal and opposite field. Hence, the electric field inside a hollow metallic charged sphere is zero.

07․ Two infinite parallel metal plates are charged with equal surface charge density of the same polarity. The electric field in the gap between the plates is
1. same as that produced by one plate.
2. double the field produced by one plate.
3. dependent on coordinates of field points.
4. zero.

06․ As a result of reflection from a plane conducting wall, electromagnetic waves acquire an apparent velocity greater than the velocity of light in space. This is called
A. the velocity of propagation.
B. normal velocity.
C. group velocity.
D. phase velocity.

Hint:
The phase velocity of a wave is the rate at which the phase of the wave propagates in space. This is the speed at which the phase of any one frequency component of the wave travels. Basically, the speed of this velocity is greater than the velocity of light in space.

05․ Conductor is static and the field is varying then emf will be induced. This principle is called
A. virtually induced emf.
B. dynamically induced emf.
C. static induced emf.
D. none of these

These are the different forms to represent the ohms law.

◽ Ohms law states that at constant temperature potential difference across the element is directly proportional to current flowing through the element.

◽ Ohms law states that at constant temperature current density is directly proportional to field intensity.

◽ Ohms law is valid only when temperature and conductivity of the material is constant.

03․ Whenever the magnetic flux changes with respect to an electric conductor or a coil, an EMF is induced in the conductor is Faraday’s
I. first law
2. second law
3. third law
4. fourth law

02․ The right hand rule for determining the direction of the induced EMF was introduced by
A. Faraday
B. Lenz
C. Fleming
D. Maxwell

HINT:
The right hand rule for determining the direction of induced EMF was introduced by Fleming and it is well known as Fleming’s right hand rule. It is used to find the direction of induced emf of a generator.

01․ Two parallel plates are separated by a distance D charged by V volt. The field intensity E is given by,
A. V × D
B. V / D
C. V × D²
D. V² / D

HINT:
Electric field intensity between two points is always expressed as the potential difference between these two points divided by the distance between them. The strength of electric field or electric field intensity is measured by volt per meter or newton per meter.

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