IIT-JEE Exam

The supply voltage to a room is 120 V. The
resistance of the lead wires is 6Ω. A 60 W bulb is
already switched on. What is the decrease of
voltage across the bulb, when a 240 W heater is
switched on in parallel to the bulb ?
(1) 13.3 V (2) 10.04 V
(3) zero V (4) 2.9 V

Read Solution (Total 0)

IIT-JEE Other Question

Diameter of a plano-convex lens is 6 cm and
thickness at the centre is 3 mm. If speed of light in
material of lens is 2 × 10^8 m/s, the focal length of
the lens is -
(1) 30 cm (2) 10 cm
(3) 15 cm (4) 20 cm A beam of unpolarised light of intensity I0 is
passed through a polaroid A and then through
another polariod B which is oriented so that its
principal plane makes an angle of 45º relative to
that of A. The intensity of the emergent light is -