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1) Microwave ovens are different than gas or electric ovens in that regular ovens get hot and then transmit that heat to the food, whereas microwave ovens heat the food and the hot food emits steam which then can heat the walls and other places in the microwave.
However, even so, it is prohibited to cook two foods of opposite classes in the microwave at once, as the aroma and the steam from the foods can be absorbed into each other and thus be prohibited to eat.
2) Also, being that...
a) The cooking area in a microwave is small and unvented
b) All food , even solid foods, produces steam quickly in a microwave
c) It is all but impossible for food particles not to splatter on the ceiling and walls of the microwave
...it is bestto not use the same microwave for [uncovered] meat and dairy, even consecutively.
If one needs to use a microwave for a food of the opposite class, the food must be adequately covered with a sealed, preferably double wrapped, covering, and be placed on a paper plate and not directly on the microwave surface. (See The Laws of Kashrus by Rav Binyomin Forst page 232-234 for a more detailed analysis of the above Halachos)
QUESTION & ANSWER CORNER:
Reader Submitted Questions of interest on topics related to Halachos we covered, as well as other interesting topic and Answers. Taken from the Q & A pages on the Halacha For Todaywebsite.
Although the answers I give to questions are taken directly from the Sifrei HaPoskim, and aren't my own, they are still for study purposes only, NOT for Psak Halacha.
Is it true that the Nodah B'Yehuda Zt'l questioned the authenticity of the Zohar HaKadosh? If so, could you provide a source in the Nodah B'Yehuda for such?
Answer:
Much has been debated over the years as to the authenticity of the Zohar. Many Geonim, Rishonim, Achronim , etc. doubted the authenticity of the Zohar or at least couldnt conclusively attribute it to Rav Shimon Bar Yochai.
However, most of our leaders in the line of Mesorah and Sifrei Halacha and Kaballah do in fact treat it as authentic (including the Arizal, the Ramchal, the Mishna Berura, Rav Moshe Feinstein Zatzal etc. just to name a few). Only when something in the Zohar is at odds with something in Halacha, do we then rule as we have it in Shulchan Aruch. (See Shu"t Radvaz Siman 1,111)
The Noda B'Yehuda you are refferring to is regarding his opposition to the Tefilah of L'Sheim Yichud (and other similar Tefilos) based on the Zohar and other similar sources outside of the Talmud, Sifra, Sifri etc. can be found in Mahadura Kamma Yoreh Deah Siman 93 and Mahadura Tinyana Orach Chaim Siman 107. See also Shu"t Teshuva M'Ahava end of Siman 1.
Many reams of paper by giants amongst men have been used in debate of this particular opinion of the holy Noda B'Yehuda, both in defense and in opposition, and we may not place ourselves inside this Machlokes L'Sheim Shomayim, and each of us must continue doing what we have been taught to do in our respective paths of Mesorah. (If you are interested in seeing some of the many Teshuvos printed about this you can look at the back of the "Mechon Yerushalayim" version of Shu"t Noda B'Yehuda, where a lot of these have been collected and printed)
Our holy sages, the Chazal tell us
תנא דבי אליהו כל השונה הלכות בכל יום מובטח לו שהוא בן עולם הבא, שנאמר הליכות עולם לו, אל תקרי הליכות אלא הלכות - one who studies [at least two] Halachos daily is assured a portion in Olam Haba - the world to come. (:מגילה כ"ח )