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Why does a wire get heated when it is bent back and forth ?

How do the back cross and test crss differ?

A wire gets heated when it is bent back and forth. Why?

Assertion: Two P-N junction diodes placed back to back, will work as a NPN transistor. Reason: The P-N junction of two PN junction diodes back to back will form the base of NPN transistor.

Ram purchased 3 notebooks that each costs ₹ 20.75 and 4 pencil that each costs ₹4.25. Ram gave ₹ 100 to the shopkeeper. How much money should Ram get back from the shopkeeper ?

Assertion : Two p-n junction diodes placed back to back, will work as a n-p-n transistor. Reason: The p-region of two p-n junction diodes back to back will form the base of n-p-n transistor.