Mathematics

NCERT Solutions for Class 12 Physics Chapter 9 Ray Optics and Optical Instruments Question 1.A small candle 2.5 cm in size is placed 27 cm in front of a concave mirror of a radius of curvature of 36 cm. At what distance from the mirror should a screen be placed in order to receive a … Read more

NCERT Solutions for Class 12 Physics Chapter 8 Electromagnetic Waves. Question 1.Figure shows a capacitor made of two circular plates each of radius 12 cm and separated by 5.0 cm. The capacitor is being charged by an external source (not shown in figure). The charging current is constant and equal to 0.15 A.(a) Calculate the … Read more

NCERT Solutions for Class 12 Physics Chapter 7 Alternating Current. Question 1.A 100 Ω resistor is connected to a 220 V, 50 Hz ac supply.(a) What is the rms value of current in the circuit?(b) What is the net power consumed over a full cycle?Answer: Question 2.(a) The peak voltage of an a.c. supply is … Read more

NCERT Solutions for Class 12 Physics Chapter 6 Electromagnetic Induction. Question 1.Predict the direction of induced current in the situations described by the following Fig. 2(a) to (f). Answer:(a) By Lenz’s law, the face of the coil towards the south pole of the magnet opposes the south pole. So this face should behave as the … Read more

NCERT Solutions for Class 12 Physics Chapter 5 Magnetism and Matter Question 1.Answer the following questions regarding earth’s magnetism :(a) A vector needs three quantities for its specification. Name the three independent quantities conventionally used to specify the earth’s magnetic field.(b) The angle of dip at a location in southern India is about 18°. Would … Read more

NCERT Solutions for Class 12 Physics Chapter 4 Moving Charges and Magnetism Question 1.A circular coil of wire consisting of 100 turns, each of radius 8.0 cm carries a current of 0.40 A. What is the magnitude of the magnetic field B at the center of the coil?Answer:Question 2.A long straight wire carries a current … Read more

Question 1.The storage battery of a car has an e.m.f. of 12 V. If the internal resistance of the battery is 0.4Ω, what is the maximum current that can be drawn from the battery ?Answer: Question 2.A battery of e.m.f. 10 V and internal resistance 3Ω is connected to a resistor. If the current in … Read more

NCERT Solutions for Class 12 Physics Chapter 2 Electrostatic Potential and Capacitance Question 1.Two charges 5 x 10-8 C and -3 x 10-8 C are located 16 cm apart. At what point(s) on the line joining the two charges is the electric potential zero? Take the potential at infinity to be zero. Ans. Let the potential be … Read more

NCERT Solutions for Class 12 Physics Chapter 1 Electric Charges and Fields Question 1.What is the force between two small charged spheres having charges of 2 x 10-7 C and 3 x 10-7 C placed 30 cm apart in the air?Answer: Question 2.The electrostatic force on a small sphere of charge 0.4 μC due to another small … Read more