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Q11
State Brewster's law. The value of Brewster angle for a transparent medium is different for light of different colours. Give reason.

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Q12
A charge is distributed uniformly over a ring of radius 'a'. Obtain an expression for the electric intensity E at a point on the axis of the ring. Hence show that for points at large distances from the ring, it behaves like a point charge.

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Q13
Write three characteristics features in photoelectric effect which cannot be explained on the basis of wave theory of light, but can be explained only using Einstein's equation.

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Q14
(a) Write the expression for the magnetic force acting on a charge particle moving with velocity v in the presence of magnetic field B. (b) A neutron, an electron and an alpha particle moving with equal velocities, enter a unifrom magnetic field going into the plane of the paper as shown. Trace their paths in the field and justify your answer.

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Q15
(i) Define mutual inductance.
(ii) Apair of adjacent coil has a mutual inductance of 1.5 H. If the current in one coil changes from 0 to 20 A in 0.5s, what is the change of the flux linkage with the other coil?

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Q16
Two parallel plate capacitors X and Y have the same area of plates and same seperation between them. X has air between the plates while Y contains a dielectric medium of 𝜀ᵣ= 4.
(i) Calculate capacitance of each capacitor if equivalent capacitance of the combination is 4𝜇F.
(ii) Calculate the potential difference between the plates of X and Y.
(iii) Estimate the ratio of electrostatic energy stored in X and Y.

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Q17
Two long straight parallel conductors carry steady current I₁ and I₂ seperated by a distance d. If the currents are flowing in the same direction, show how the magnetic field set up in one produces an attractive force on the other. Obtain the expression for this force. Hence define one ampere.

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Q18
How are em waves produced by oscilllating chargres? Draw a sketch of linearly polarized em waves propagating in the Z- direction. Indicate the directions of the oscillating electric and magnetic fields

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Q19
Write Maxwell's generalization of Ampere's Circuital Law. Show that in the process of charging a capacitor, the current produced within the plates of the capacitor is i = 𝜖ₒ d𝜙 E/dt where 𝜙𝜖 is the electric flux produced during charging of the capacitor plates.

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Q20
(a) Explain any two factors which justify the need of modulating a low frequency signal.
(b) Write two advantages of frequency modulation over amplitude modulation.

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2016

Q11
State Brewster's law. The value of Brewster angle for a transparent medium is different for light of different colours. Give reason.

Solution

Q12
A charge is distributed uniformly over a ring of radius 'a'. Obtain an expression for the electric intensity E at a point on the axis of the ring. Hence show that for points at large distances from the ring, it behaves like a point charge.

Solution

Q13
Write three characteristics features in photoelectric effect which cannot be explained on the basis of wave theory of light, but can be explained only using Einstein's equation.

Solution

Solution

Q15
(i) Define mutual inductance.
(ii) Apair of adjacent coil has a mutual inductance of 1.5 H. If the current in one coil changes from 0 to 20 A in 0.5s, what is the change of the flux linkage with the other coil?

Solution

Solution

Solution

Q18
How are em waves produced by oscilllating chargres? Draw a sketch of linearly polarized em waves propagating in the Z- direction. Indicate the directions of the oscillating electric and magnetic fields

Solution

Q19
Write Maxwell's generalization of Ampere's Circuital Law. Show that in the process of charging a capacitor, the current produced within the plates of the capacitor is i = 𝜖ₒ d𝜙 E/dt where 𝜙𝜖 is the electric flux produced during charging of the capacitor plates.

Solution

Q20
(a) Explain any two factors which justify the need of modulating a low frequency signal.
(b) Write two advantages of frequency modulation over amplitude modulation.

Solution

Subjects

2016

Q11 State Brewster's law. The value of Brewster angle for a transparent medium is different for light of different colours. Give reason.

Solution

Q12 A charge is distributed uniformly over a ring of radius 'a'. Obtain an expression for the electric intensity E at a point on the axis of the ring. Hence show that for points at large distances from the ring, it behaves like a point charge.

Solution

Q13 Write three characteristics features in photoelectric effect which cannot be explained on the basis of wave theory of light, but can be explained only using Einstein's equation.

Solution

Solution

Q15 (i) Define mutual inductance. (ii) Apair of adjacent coil has a mutual inductance of 1.5 H. If the current in one coil changes from 0 to 20 A in 0.5s, what is the change of the flux linkage with the other coil?

Solution

Solution

Solution

Q18 How are em waves produced by oscilllating chargres? Draw a sketch of linearly polarized em waves propagating in the Z- direction. Indicate the directions of the oscillating electric and magnetic fields

Solution

Q19 Write Maxwell's generalization of Ampere's Circuital Law. Show that in the process of charging a capacitor, the current produced within the plates of the capacitor is i = 𝜖ₒ d𝜙 E/dt where 𝜙𝜖 is the electric flux produced during charging of the capacitor plates.

Solution

Q20 (a) Explain any two factors which justify the need of modulating a low frequency signal. (b) Write two advantages of frequency modulation over amplitude modulation.

Solution

Subjects

Q11
State Brewster's law. The value of Brewster angle for a transparent medium is different for light of different colours. Give reason.

Q12
A charge is distributed uniformly over a ring of radius 'a'. Obtain an expression for the electric intensity E at a point on the axis of the ring. Hence show that for points at large distances from the ring, it behaves like a point charge.

Q13
Write three characteristics features in photoelectric effect which cannot be explained on the basis of wave theory of light, but can be explained only using Einstein's equation.

Q15
(i) Define mutual inductance.
(ii) Apair of adjacent coil has a mutual inductance of 1.5 H. If the current in one coil changes from 0 to 20 A in 0.5s, what is the change of the flux linkage with the other coil?

Q18
How are em waves produced by oscilllating chargres? Draw a sketch of linearly polarized em waves propagating in the Z- direction. Indicate the directions of the oscillating electric and magnetic fields

Q19
Write Maxwell's generalization of Ampere's Circuital Law. Show that in the process of charging a capacitor, the current produced within the plates of the capacitor is i = 𝜖ₒ d𝜙 E/dt where 𝜙𝜖 is the electric flux produced during charging of the capacitor plates.

Q20
(a) Explain any two factors which justify the need of modulating a low frequency signal.
(b) Write two advantages of frequency modulation over amplitude modulation.