The difference between threshold wavelengths for two metal surfaces A and B having work function
(1) 264
(2) 138
(3) 276
(4) 540
JEE-2024
Solution:
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The magnetic field at the centre of a wire loop formed by two semi circular wires of radii R1 = 2 πm and R2 = 4π m carrying current I = 4A as per figure given below is a × 10^–7 T. The value of a is ______. (Centre O is common for all segments)
