Electromagnetic Induction — Physics STD 12 Science — Question

Two identical p-ri junctions may be connected in series with a battery in three ways (figure). The potential difference across the two p-n. junctions are equal in:

A conductor in the form of a right angle ABC with AB = 3 cm and BC = 4 cm carries a current of 10 A. There is a uniform magnetic field of 5 T perpendicular to the plane of the conductor. The force on the conductor will be(a) 1.5 N (b) 2.0 N(c) 2.5 N (d) 3.5 N

A convex lens is in contact with concave lens. The magnitude of the ratio of their focal length is 2/3. Their equivalent focal length is 30 cm. What are their individual focal lengths(a) – 75, 50(b) – 10, 15(c) 75, 50(d) – 15, 10

If intensity of incident light is increased in PEE then which of the following is true(a) Maximum K.E. of ejected electron will increase(b) Work function will remain unchanged(c) Stopping potential will decrease(d) Maximum K.E. of ejected electron will decrease

A transformer is used to(a) Change the alternating potential (b) Change the alternating current(c) To prevent the power loss in alternating current flow (d) To increase the power of current source

By increasing the temperature, the specific resistance of a conductor and a semiconductor: