IIT-JEE Exam

The magnetic field in a traveling electromagnetic
wave has a peak value of 20 nT. The peak value of
electric field strength is -
(1) 9 V/m (2) 12 V/m
(3) 3 V/m (4) 6 V/m

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IIT-JEE Other Question

In an LCR circuit both switches
are open initially. Now switch S1 is closed S2 kept
open. (q is charge on the capacitor and τ = RC is
Capacitive time constant). Which of the following
statement is correct ?
(1) At t = 2τ, q = CV (1 – e–2)
(2) At t =
2
τ , q = CV (1 – e–1)
(3) Work done by the battery is half of the energy
dissipated in the resistor
(4) At t = τ, q = CV/2 The real number k for which the equation, 2x^3 + 3x
+ k = 0 has two distinct real roots in [0, 1]
(1) lies between –1 and 0
(2) does not exist
(3) lies between 1 and 2
(4) lies between 2 and 3