Enjoy these sweet melodies till then
{Physics problems are already a lot in the group }
{Physics problems are already a lot in the group }
🎯JEE Advanced 2025 Date Announced!
18th May 2025 (Sunday)
18th May 2025 (Sunday)
proposition : every even natural number greater than 2 is the sum of two prime numbers. ex: 60= 23+37
Is this true or false, this proposition?
Is this true or false, this proposition?
Anonymous Quiz
39%
True
33%
False
28%
Nobody knows if this is true or false
A uniform tube with an inner radius R carrying steam at 100°C is constructed of a material with thermal conductivity k1 and thickness d (d<R) . The tube has an outer thermal conductivity k2 (k1>k2) and possesses an insulation layer with thickness d. At an constant ambient temperature of 25°C, the temperature(theta) variation along the radial distance x from the center of the tube in steady state is effectively characterized by :
The battery Eo with internal resistance r_o and variable resistance R are connected in series with a combination that has both an emf E1 (E1<Eo) and a resistance r1, which is parallel to another combination that has an emf E2 and a resistance r2, as shown in the figure. Meanwhile, the combination with eemf E2 (E2<E0) is connected in series with a key S. When the key S is connected in an open state as shown in the figure, a balance length of "l" is obtained. If the key S is then closed,
(A) if E1>E2, the new balance length obtained will be greater than l.
(B) if E1<E2, to obtain the same balance length of l, the value of the resistance R must be reduced.
(C) if E1<E2, the new balance length obtained will be greater than l.
Among the statements mentioned above, the true statement(s) is/are:
(1) only (A)
(2) only (C)
(3) (A), (B) only
(4) (B), (C) only
(5) all (A), (B), (C)
(A) if E1>E2, the new balance length obtained will be greater than l.
(B) if E1<E2, to obtain the same balance length of l, the value of the resistance R must be reduced.
(C) if E1<E2, the new balance length obtained will be greater than l.
Among the statements mentioned above, the true statement(s) is/are:
(1) only (A)
(2) only (C)
(3) (A), (B) only
(4) (B), (C) only
(5) all (A), (B), (C)